中学生网络课堂本课配套习题挑战模式1/5
单选题
难度系数：
1.
已知函数f(x)＝
x3－2x2＋3m，x∈[0，＋∞)，若f(x)＋5≥0恒成立，则实数m的取值范围是 ( )
| A:
|
| B:
|
| C: (－∞，2] |
| D: (－∞，2) |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5rGC5a+877yM56Gu5a6a5Ye95pWw55qE5Y2V6LCD5Yy66Ze0PC9wPg==
- 提示2：PHA+5rGC5Ye95pWw55qE5pyA5bCP5YC8PC9wPg==
- 答案：QQ==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.
已知函数f(x)＝x－
，g(x)＝x2－2ax＋4，若任意x1∈[0,1]，存在x2∈[1,2]，使f(x1)≥g(x2)，则实数a的取值范围是（）
| A: [-1，＋∞] |
| B:
|
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+54m556ew5ZG96aKY5LiO5YWo56iL5ZG96aKY55qE5YiG5p6QPC9wPg==
- 提示2：PHA+5rGCPGk+ZjwvaT4oPGk+eDwvaT4p55qE5pyA5bCP5YC85LiOPGk+ZzwvaT4oPGk+eDwvaT4p55qE5pyA5aSn5YC8PGJyPjwvcD4=
- 提示3：PHA+5YCf5Yqp5a+85Ye95pWw5rGC5pyA5YC8PGJyPjwvcD4=
- 答案：Qg==
<p>由于<i>f</i>′(<i>x</i>)＝1＋<img src="https://p1.qingguo.com/G1/M00/73/7C/rBACE1TJpniB_B-0AAACNvWfO-Y748.png" data-cke-saved-src="https://p1.qingguo.com/G1/M00/73/7C/rBACE1TJpniB_B-0AAACNvWfO-Y748.png" height="43" width="48">.因此函数<em>f</em>(<em>x</em>)在[0,1]上单调递增，所以<em>x</em>∈[0,1]时，<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><var class="florin" mathquill-command-id="9">ƒ</var><span style="display:inline-block;width:0" mathquill-command-id="9">&nbsp;</span><span class="non-leaf" mathquill-command-id="10"><span style="transform: scale(1, 1.05);" class="scaled paren">(</span><span class="non-leaf" mathquill-block-id="11"><var mathquill-command-id="13">x</var></span><span style="transform: scale(1, 1.05);" class="scaled paren">)</span></span><sub class="non-leaf" mathquill-command-id="6" mathquill-block-id="7"><var mathquill-command-id="14">m</var><var mathquill-command-id="15">i</var><var mathquill-command-id="16">n</var></sub></span><span>&nbsp;</span>＝<em>f</em>(0)＝－1.<br>根据题意可知存在<em>x</em>∈[1,2]，使得<em>g</em>(<em>x</em>)＝<em>x</em><sup>2</sup>－2<em>ax</em>＋4≤－1，即<em>x</em><sup>2</sup>－2<em>ax</em>＋5≤0，即<em>a</em>≥<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span class="fraction non-leaf" mathquill-command-id="4"><span class="numerator" mathquill-block-id="5"><var mathquill-command-id="8">x</var></span><span class="denominator" mathquill-block-id="6"><span mathquill-command-id="9">2</span></span><span style="display:inline-block;width:0">&nbsp;</span></span></span><span>&nbsp;</span>＋<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span class="fraction non-leaf" mathquill-command-id="4"><span class="numerator" mathquill-block-id="5"><span mathquill-command-id="11">5</span></span><span class="denominator" mathquill-block-id="6"><span mathquill-command-id="9">2</span><var mathquill-command-id="12">x</var></span><span style="display:inline-block;width:0">&nbsp;</span></span></span><span>&nbsp;</span>能成立，<br>令<em>h</em>(<em>x</em>)＝<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span class="fraction non-leaf" mathquill-command-id="4"><span class="numerator" mathquill-block-id="5"><var mathquill-command-id="8">x</var></span><span class="denominator" mathquill-block-id="6"><span mathquill-command-id="9">2</span></span><span style="display:inline-block;width:0">&nbsp;</span></span></span><span>&nbsp;</span>＋<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span class="fraction non-leaf" mathquill-command-id="4"><span class="numerator" mathquill-block-id="5"><span mathquill-command-id="11">5</span></span><span class="denominator" mathquill-block-id="6"><span mathquill-command-id="9">2</span><var mathquill-command-id="12">x</var></span><span style="display:inline-block;width:0">&nbsp;</span></span></span><span>&nbsp;</span>，则要使<em>a</em>≥<em>h</em>(<em>x</em>)在<em>x</em>∈[1,2]能成立，只需使<em>a</em>≥<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><var mathquill-command-id="18">h</var><span class="non-leaf" mathquill-command-id="19"><span style="transform: scale(1, 1.05);" class="scaled paren">(</span><span class="non-leaf" mathquill-block-id="20"><var mathquill-command-id="22">x</var></span><span style="transform: scale(1, 1.05);" class="scaled paren">)</span></span><sub class="non-leaf" mathquill-command-id="15" mathquill-block-id="16"><var mathquill-command-id="23">m</var><var mathquill-command-id="24">i</var><var mathquill-command-id="25">n</var></sub></span><span>&nbsp;</span>，<br>又函数<em>h</em>(<em>x</em>)＝<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span class="fraction non-leaf" mathquill-command-id="26"><span class="numerator" mathquill-block-id="27"><var mathquill-command-id="30">x</var></span><span class="denominator" mathquill-block-id="28"><span mathquill-command-id="31">2</span></span><span style="display:inline-block;width:0">&nbsp;</span></span></span><span>&nbsp;</span>＋<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span class="fraction non-leaf" mathquill-command-id="26"><span class="numerator" mathquill-block-id="27"><span mathquill-command-id="32">5</span></span><span class="denominator" mathquill-block-id="28"><span mathquill-command-id="31">2</span><var mathquill-command-id="33">x</var></span><span style="display:inline-block;width:0">&nbsp;</span></span></span><span>&nbsp;</span>在<em>x</em>∈[1,2]上单调递减(可利用导数判断)，<br>所以<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><var mathquill-command-id="17">h</var><span class="non-leaf" mathquill-command-id="10"><span style="transform: scale(1, 1.05);" class="scaled paren">(</span><span class="non-leaf" mathquill-block-id="11"><var mathquill-command-id="13">x</var></span><span style="transform: scale(1, 1.05);" class="scaled paren">)</span></span><sub class="non-leaf" mathquill-command-id="6" mathquill-block-id="7"><var mathquill-command-id="14">m</var><var mathquill-command-id="15">i</var><var mathquill-command-id="16">n</var></sub></span><span>&nbsp;</span>＝<em>h</em>(2)＝<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span class="fraction non-leaf" mathquill-command-id="26"><span class="numerator" mathquill-block-id="27"><span mathquill-command-id="34">9</span></span><span class="denominator" mathquill-block-id="28"><span mathquill-command-id="35">4</span></span><span style="display:inline-block;width:0">&nbsp;</span></span></span><span>&nbsp;</span>，故只需<em>a</em>≥<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span class="fraction non-leaf" mathquill-command-id="26"><span class="numerator" mathquill-block-id="27"><span mathquill-command-id="34">9</span></span><span class="denominator" mathquill-block-id="28"><span mathquill-command-id="35">4</span></span><span style="display:inline-block;width:0">&nbsp;</span></span></span><span>&nbsp;</span>.<br></p>
本课配套习题挑战模式3/5
单选题
难度系数：
3.
若存在x∈[﹣2，3]，使不等式2x﹣x2≥a成立，则实数a的取值范围是（ ）
| A:
|
| B:
|
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+55Sx5p2h5Lu25Yip55So5LqM5qyh5Ye95pWw55qE5oCn6LSo5rGC5b6X5Ye95pWwZu+8iHjvvIk9MngteDxzdXA+Mjwvc3VwPuWcqOKIiFstMu+8jDNd5LiK55qE5pyA5aSn5YC877yM5Y+v5b6XYeeahOiMg+WbtO+8jjwvcD4=
- 答案：QQ==
PHA+6Kej77ya5b2TeOKIiFstMu+8jDNd5pe277yM5Ye95pWwZu+8iHjvvIk9MngteDxzdXA+Mjwvc3VwPj0t77yIeC0x77yJPHN1cD4yPC9zdXA+KzHvvIw8YnI+5pWF5b2TeD0x5pe277yMZu+8iHjvvInlj5blvpfmnIDlpKflgLzkuLox77yOPGJyPueUseS6juWtmOWcqHjiiIhbLTLvvIwzXe+8jOS9v+S4jeetieW8jzJ4LXg8c3VwPjI8L3N1cD7iiaVh5oiQ56uL77yM4oi0YeKJpDHvvIw8YnI+5pWF6YCJ77yaQe+8jjwvcD4=
本课配套习题挑战模式4/5
单选题
难度系数：
4.
若存在x使不等式x−mex >√x 成立，则实数m的取值范围为（ ）
| A:
|
| B:
|
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5YyW566A5LiN562J5byPPC9wPg==
- 提示2：PHA+5p6E6YCg5Ye95pWw77yM5Yip55So5a+85pWw56CU56m25Y2V6LCD5oCn5LiO5p6B5YC8PC9wPg==
- 答案：Qw==
<p>解：由<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span class="fraction non-leaf" mathquill-command-id="4"><span class="numerator" mathquill-block-id="5"><var mathquill-command-id="8">x</var><span class="binary-operator" mathquill-command-id="9">−</span><var mathquill-command-id="10">m</var></span><span class="denominator" mathquill-block-id="6"><var mathquill-command-id="16">e</var><sup class="non-leaf" mathquill-command-id="13" mathquill-block-id="14"><var mathquill-command-id="17">x</var></sup></span><span style="display:inline-block;width:0">&nbsp;</span></span><span class="binary-operator" mathquill-command-id="18">&gt;</span><span class="non-leaf" mathquill-command-id="20"><span style="transform: scale(1, 0.9);" class="scaled sqrt-prefix">√</span><span class="non-leaf sqrt-stem" mathquill-block-id="21"><var mathquill-command-id="23">x</var></span></span></span><span>得：</span><span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span class="" mathquill-command-id="24">−</span><var mathquill-command-id="25">m</var><span class="binary-operator" mathquill-command-id="26">&gt;</span><var mathquill-command-id="33">e</var><sup class="non-leaf" mathquill-command-id="30" mathquill-block-id="31"><var mathquill-command-id="34">x</var></sup><span mathquill-command-id="35">×</span><span class="non-leaf" mathquill-command-id="36"><span style="transform: scale(1, 0.9);" class="scaled sqrt-prefix">√</span><span class="non-leaf sqrt-stem" mathquill-block-id="37"><var mathquill-command-id="39">x</var></span></span><span class="binary-operator" mathquill-command-id="40">−</span><var mathquill-command-id="41">x</var></span><span>&nbsp; ,</span><br></p><p><span>令</span><span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><var class="florin" mathquill-command-id="8">ƒ</var><span style="display:inline-block;width:0" mathquill-command-id="8">&nbsp;</span><span class="non-leaf" mathquill-command-id="9"><span style="transform: scale(1, 1.05);" class="scaled paren">(</span><span class="non-leaf" mathquill-block-id="10"><var mathquill-command-id="12">x</var></span><span style="transform: scale(1, 1.05);" class="scaled paren">)</span></span><span class="binary-operator" mathquill-command-id="13">=</span><var mathquill-command-id="19">e</var><sup class="non-leaf" mathquill-command-id="16" mathquill-block-id="17"><var mathquill-command-id="20">x</var></sup><span class="binary-operator" mathquill-command-id="21">×</span><span class="non-leaf" mathquill-command-id="23"><span style="transform: scale(1, 0.9);" class="scaled sqrt-prefix">√</span><span class="non-leaf sqrt-stem" mathquill-block-id="24"><var mathquill-command-id="26">x</var></span></span><span class="binary-operator" mathquill-command-id="27">−</span><var mathquill-command-id="28">x</var></span><span> </span>,则<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span class="" mathquill-command-id="30">−</span><var mathquill-command-id="31">m</var><span class="binary-operator" mathquill-command-id="32">&gt;</span><var class="florin" mathquill-command-id="39">ƒ</var><span style="display:inline-block;width:0" mathquill-command-id="39">&nbsp;</span><span class="non-leaf" mathquill-command-id="40"><span style="transform: scale(1, 1.05);" class="scaled paren">(</span><span class="non-leaf" mathquill-block-id="41"><var mathquill-command-id="43">x</var></span><span style="transform: scale(1, 1.05);" class="scaled paren">)</span></span><sub class="non-leaf" mathquill-command-id="36" mathquill-block-id="37"><var mathquill-command-id="44">m</var><var mathquill-command-id="45">i</var><var mathquill-command-id="46">n</var></sub></span><span> </span>.</p><p><span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><var class="florin" mathquill-command-id="52">ƒ</var><span style="display:inline-block;width:0" mathquill-command-id="52">&nbsp;</span><sup class="non-leaf" mathquill-command-id="49" mathquill-block-id="50"><span mathquill-command-id="54">′</span></sup><span class="non-leaf" mathquill-command-id="55"><span style="transform: scale(1, 1.05);" class="scaled paren">(</span><span class="non-leaf" mathquill-block-id="56"><var mathquill-command-id="58">x</var></span><span style="transform: scale(1, 1.05);" class="scaled paren">)</span></span><span class="binary-operator" mathquill-command-id="59">=</span><var mathquill-command-id="65">e</var><sup class="non-leaf" mathquill-command-id="62" mathquill-block-id="63"><var mathquill-command-id="66">x</var></sup><span class="binary-operator" mathquill-command-id="67">×</span><span class="non-leaf" mathquill-command-id="69"><span style="transform: scale(1, 0.9);" class="scaled sqrt-prefix">√</span><span class="non-leaf sqrt-stem" mathquill-block-id="70"><var mathquill-command-id="72">x</var></span></span><span class="binary-operator" mathquill-command-id="73">+</span><var mathquill-command-id="79">e</var><sup class="non-leaf" mathquill-command-id="76" mathquill-block-id="77"><var mathquill-command-id="80">x</var></sup><span class="binary-operator" mathquill-command-id="81">×</span><span class="fraction non-leaf" mathquill-command-id="83"><span class="numerator" mathquill-block-id="84"><span mathquill-command-id="92">1</span></span><span class="denominator" mathquill-block-id="85"><span mathquill-command-id="87">2</span><span class="non-leaf" mathquill-command-id="88"><span style="transform: scale(1, 0.9);" class="scaled sqrt-prefix">√</span><span class="non-leaf sqrt-stem" mathquill-block-id="89"><var mathquill-command-id="91">x</var></span></span></span><span style="display:inline-block;width:0">&nbsp;</span></span><span class="binary-operator" mathquill-command-id="93">−</span><span mathquill-command-id="94">1</span></span><span>&nbsp;</span><span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span class="binary-operator" mathquill-command-id="95">&gt;</span><span mathquill-command-id="97">0</span></span><span> </span>.</p><p>所以<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><var class="florin" mathquill-command-id="5">ƒ</var><span style="display:inline-block;width:0" mathquill-command-id="5">&nbsp;</span><span class="non-leaf" mathquill-command-id="6"><span style="transform: scale(1, 1.05);" class="scaled paren">(</span><span class="non-leaf" mathquill-block-id="7"><var mathquill-command-id="9">x</var></span><span style="transform: scale(1, 1.05);" class="scaled paren">)</span></span><span class="binary-operator" mathquill-command-id="10">≥</span><var class="florin" mathquill-command-id="12">ƒ</var><span style="display:inline-block;width:0" mathquill-command-id="12">&nbsp;</span><span class="non-leaf" mathquill-command-id="13"><span style="transform: scale(1, 1.05);" class="scaled paren">(</span><span class="non-leaf" mathquill-block-id="14"><span mathquill-command-id="16">0</span></span><span style="transform: scale(1, 1.05);" class="scaled paren">)</span></span><span class="binary-operator" mathquill-command-id="18">=</span><span mathquill-command-id="19">0</span><span mathquill-command-id="20">,</span></span><span>&nbsp;</span><span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span></span><span> </span><span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span class="" mathquill-command-id="21">−</span><var mathquill-command-id="22">m</var><span class="binary-operator" mathquill-command-id="23">&gt;</span><var class="florin" mathquill-command-id="12">ƒ</var><span style="display:inline-block;width:0" mathquill-command-id="12">&nbsp;</span><span class="non-leaf" mathquill-command-id="13"><span style="transform: scale(1, 1.05);" class="scaled paren">(</span><span class="non-leaf" mathquill-block-id="14"><span mathquill-command-id="16">0</span></span><span style="transform: scale(1, 1.05);" class="scaled paren">)</span></span><span class="binary-operator" mathquill-command-id="18">=</span><span mathquill-command-id="19">0</span><span mathquill-command-id="20">,</span><var mathquill-command-id="25">m</var><span class="binary-operator" mathquill-command-id="26">&lt;</span><span mathquill-command-id="28">0</span></span><span> .</span></p><p><span>选C</span></p>
本课配套习题挑战模式5/5
单选题
难度系数：
5.
已知函数
，不等式 
恒成立，则实数
的取值范围是（ ）
| A:
|
| B:
|
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5LiN562J5byP5bem6L655piv5YiG5q615Ye95pWw77yM5YiG5Yir5rGC5pyA5aSn5YC8PC9wPg==
- 提示2：PHA+5pyA5aSn5YC85Luj5YWl77yM5b6X5Yiw5LiA5YWD5LqM5qyh5LiN562J5byPPC9wPg==
- 提示3：PHA+6Kej5LiN562J5byP5Y2z5b6XPC9wPg==
- 答案：Qg==
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
