中学生网络课堂本课配套习题挑战模式1/3
单选题
难度系数：
1.
等差数列{an} 的前n项和为Sn ，已知a1=13 ,S3=S11 ,当Sn 最大时，n的值是（ ）
| A: 5 |
| B: 6 |
| C: 7 |
| D: 8 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5Lik56eN5pa55rOV77yM5pa55rOV5LiA77ya5om+5Ye65YW25Lit5Lik6aG577yM5LiA6aG55bCP5LqO5oiW562J5LqOMO+8jOS4gOmhueaIluWkp+S6juetieS6jjAu5pa55rOV5LqM77ya5Yip55So5LqM5qyh5Ye95pWwPGJyPjwvcD4=
- 答案：Qw==
PHA+PGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzM3LzU5L3JCQUNKbFMxMzZUU0hIc1FBQUFuVE5DcVRVUTMwMS5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMzcvNTkvckJBQ0psUzEzNlRTSEhzUUFBQW5UTkNxVFVRMzAxLnBuZyIgYWx0PSIiIHN0eWxlPSJ3aWR0aDogNTg4cHg7IGhlaWdodDogMjAxcHg7Ij48YnI+PC9wPg==
本课配套习题挑战模式2/3
单选题
难度系数：
2.
已知数列{an} 是等差数列，且a2=−1,a5=5 ,试问当n等于多少时，前n项和最小？
| A: 1 |
| B: 2 |
| C: 3 |
| D: 4 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 答案：Qg==
<p>解析：方法一：设数列<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span class="non-leaf" mathquill-command-id="22"><span style="transform: scale(1.06, 1.365);" class="scaled paren">{</span><span class="non-leaf" mathquill-block-id="23"><var mathquill-command-id="30">a</var><sub class="non-leaf" mathquill-command-id="26" mathquill-block-id="27"><var mathquill-command-id="29">n</var></sub></span><span style="transform: scale(1.06, 1.365);" class="scaled paren">}</span></span></span><span>的公差为d, </span><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="10">a</var><sub class="non-leaf" mathquill-command-id="6" mathquill-block-id="7"><span mathquill-command-id="9">5</span></sub><span class="binary-operator" mathquill-command-id="11">−</span><var mathquill-command-id="18">a</var><sub class="non-leaf" mathquill-command-id="14" mathquill-block-id="15"><span mathquill-command-id="17">2</span></sub><span class="binary-operator" mathquill-command-id="19">=</span><span mathquill-command-id="20">3</span><var mathquill-command-id="21">d</var></span><span> </span>,所以<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span mathquill-command-id="31">3</span><var mathquill-command-id="32">d</var><span class="binary-operator" mathquill-command-id="33">=</span><span mathquill-command-id="34">6</span><span mathquill-command-id="39">,</span><var mathquill-command-id="36">d</var><span class="binary-operator" mathquill-command-id="37">=</span><span mathquill-command-id="38">2</span></span><span> </span>,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="46">a</var><sub class="non-leaf" mathquill-command-id="42" mathquill-block-id="43"><span mathquill-command-id="52">2</span></sub><span class="binary-operator" mathquill-command-id="53">−</span><var mathquill-command-id="54">d</var><span class="binary-operator" mathquill-command-id="55">=</span><var mathquill-command-id="62">a</var><sub class="non-leaf" mathquill-command-id="58" mathquill-block-id="59"><span mathquill-command-id="61">1</span></sub><span class="binary-operator" mathquill-command-id="63">=</span><span class="unary-operator" mathquill-command-id="64">−</span><span mathquill-command-id="65">3</span></span><span> </span>,所以通项公式<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="46">a</var><sub class="non-leaf" mathquill-command-id="42" mathquill-block-id="43"><var mathquill-command-id="45">n</var></sub><span class="binary-operator" mathquill-command-id="47">=</span><span mathquill-command-id="48">2</span><var mathquill-command-id="49">n</var><span class="binary-operator" mathquill-command-id="50">−</span><span mathquill-command-id="51">5</span></span><span> </span>,因为<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="46">a</var><sub class="non-leaf" mathquill-command-id="42" mathquill-block-id="43"><span mathquill-command-id="52">2</span></sub><span class="binary-operator" mathquill-command-id="66">=</span><span class="unary-operator" mathquill-command-id="67">−</span><span mathquill-command-id="68">1</span><span class="binary-operator" mathquill-command-id="69">&lt;</span><span mathquill-command-id="71">0</span><span mathquill-command-id="72">，</span><var mathquill-command-id="86">a</var><sub class="non-leaf" mathquill-command-id="82" mathquill-block-id="83"><span mathquill-command-id="85">3</span></sub><span class="binary-operator" mathquill-command-id="87">=</span><span mathquill-command-id="88">1</span><span class="binary-operator" mathquill-command-id="89">&gt;</span><span mathquill-command-id="91">0</span></span><span> </span>,所以当n=2时，前n项和最小。<br></p><p>方法二：求出<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="46">a</var><sub class="non-leaf" mathquill-command-id="42" mathquill-block-id="43"><span mathquill-command-id="93">1</span></sub><span class="binary-operator" mathquill-command-id="66">=</span><span class="unary-operator" mathquill-command-id="94">−</span><span mathquill-command-id="95">3</span><span mathquill-command-id="96">,</span><var mathquill-command-id="97">d</var><span class="binary-operator" mathquill-command-id="98">=</span><span mathquill-command-id="99">2</span><span mathquill-command-id="100">,</span></span><span> </span>可知<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="107">S</var><sub class="non-leaf" mathquill-command-id="103" mathquill-block-id="104"><var mathquill-command-id="106">n</var></sub><span class="binary-operator" mathquill-command-id="108">=</span><span class="non-leaf" mathquill-command-id="115"><span style="transform: scale(1, 1.05);" class="scaled paren">(</span><span class="non-leaf" mathquill-block-id="116"><var mathquill-command-id="118">n</var><span class="binary-operator" mathquill-command-id="119">−</span><span mathquill-command-id="120">2</span></span><span style="transform: scale(1, 1.05);" class="scaled paren">)</span></span><sup class="non-leaf" mathquill-command-id="111" mathquill-block-id="112"><span mathquill-command-id="114">2</span></sup><span class="binary-operator" mathquill-command-id="121">−</span><span mathquill-command-id="122">4</span></span><span> </span>,所以当n=2时，前n项和最小<br></p>
本课配套习题挑战模式3/3
单选题
难度系数：
3.
设等差数列{an} 的前n项和为Sn ,公差d<0 ,且S12>0，S13<0 ,当n为多少时，前n项和最大？
| A: 5 |
| B: 6 |
| C: 7 |
| D: 8 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5qC55o2uPHNwYW4gY2xhc3M9Im1hdGhxdWlsbC1yZW5kZXJlZC1tYXRoIiBzdHlsZT0iZm9udC1zaXplOjIwcHg7Ij48c3BhbiBjbGFzcz0idGV4dGFyZWEiPjx0ZXh0YXJlYSBkYXRhLWNrZS1lZGl0YWJsZT0iMSIgY29udGVudGVkaXRhYmxlPSJmYWxzZSI+PC90ZXh0YXJlYT48L3NwYW4+PHZhciBtYXRocXVpbGwtY29tbWFuZC1pZD0iMTEiPlM8L3Zhcj48c3ViIGNsYXNzPSJub24tbGVhZiIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjYiIG1hdGhxdWlsbC1ibG9jay1pZD0iNyI+PHNwYW4gbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjkiPjE8L3NwYW4+PHNwYW4gbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjEwIj4yPC9zcGFuPjwvc3ViPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIxMiI+5ZKMPC9zcGFuPjx2YXIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjIwIj5TPC92YXI+PHN1YiBjbGFzcz0ibm9uLWxlYWYiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIxNSIgbWF0aHF1aWxsLWJsb2NrLWlkPSIxNiI+PHNwYW4gbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjE4Ij4xPC9zcGFuPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIxOSI+Mzwvc3Bhbj48L3N1Yj48L3NwYW4+PHNwYW4+IDwvc3Bhbj7liKTmlq3lh7rnm7jpgrvkuKTpobnvvIzlk6rkuIDpobnlpKfkuo4w77yM5ZOq5LiA6aG55bCP5LqOMDxicj48L3A+
- 答案：Qg==
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