中学生网络课堂
初二数学 (北师版)
二次根式
本课配套习题挑战模式1/5
单选题
难度系数：
1.k、m、n为三整数，若
=k
，
=15
，
=6
，则下列有关于k、m、n的大小关系，何者正确？（ ）
=k，=15，=6，则下列有关于k、m、n的大小关系，何者正确？（ ） | A: k＜m=n |
| B: m=n＜k |
| C: m＜n＜k |
| D: m＜k＜n |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNruS6jOasoeagueW8j+eahOWMlueugOWFrOW8j+W+l+WIsGvvvIxt5Y+KbueahOWAvO+8jOWNs+WPr+S9nOWHuuWIpOaWrS4=
- 答案：RA==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.甲、乙两人对题目“化简并求值：
+
，其中a＝
”有不同的解答，
甲的解答是：+=+
=
；
乙的解答是：：+==+=
=；
在两人的解法中（ ）
+，其中a＝”有不同的解答，甲的解答是：
+=+=；乙的解答是：：
+==+==；在两人的解法中（ ）
| A: 甲正确 |
| B: 乙正确 |
| C: 都不正确 |
| D: 无法确定 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOWFiOWIqeeUqOWujOWFqOW5s+aWueWFrOW8j+WPmOW9ouW+l+WIsOWOn+W8jz08aW1nIHdpZHRoPTcgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvQjIvMEQvckJBQ0UxUGtPTzZCZlNEeUFBQUJNektLb2JFMTY4LnBuZyI+KzxpbWcgd2lkdGg9NzEgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvQjIvMEQvckJBQ0UxUGtPTzd6cm5HVUFBQUMwU2FUUHFJNTQxLnBuZyI+
- 提示2：IOWGjeWIqeeUqOS6jOasoeagueW8j+eahOaAp+i0qOW+l+WIsOWOn+W8jz08aW1nIHdpZHRoPTcgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvQjIvMEQvckJBQ0UxUGtPTzZCZlNEeUFBQUJNektLb2JFMTY4LnBuZyI+K3w8aW1nIHdpZHRoPTM2IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0IyLzBEL3JCQUNFMVBrT083Z2NIQVJBQUFCakVqbXFlYzQ1Mi5wbmciPnw=
- 提示3：IOeEtuWQjuagueaNrmHnmoTlgLzljrvnu53lr7nlgLzlkI7lkIjlubbljbPlj68=
- 答案：QQ==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.设S1=1，S2=1+3，S3=1+3+5，…，Sn=1+3+5+…+（2n-1），S=
+
+……+
，其中n为正整数，用含n的代数式表示S为（ ）
++……+，其中n为正整数，用含n的代数式表示S为（ ） | A: n |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：IOaxguWHulM8c3ViPjE8L3N1Yj7vvIxTPHN1Yj4yPC9zdWI+77yMUzxzdWI+Mzwvc3ViPu+8jOKApueahOWAvO+8jOmDveaYr+WujOWFqOW5s+aWueaVsO+8jOS7o+WFpeWQjuagueaNruS6jOasoeagueW8j+eahOaAp+i0qOaxguWHuuavj+S4gOmDqOWIhueahOWAvO+8jOWGjeaxguWHuuacgOWQjue7k+aenOWNs+WPry4=
- 答案：RA==
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
本课配套习题挑战模式4/5
单选题
难度系数：
4.
化简1√8+√11 +1√11+√14 +1√14+√17 +1√17+√20 +1√20+√23 +1√23+√26 +1√26+√29 +1√29+√32 的结果是（ ）
| A: 1 |
| B:
|
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6aaW5YWI5a+55q+P5Liq5Yqg5pWw6L+b6KGM5Y675YiG5q+N5YyW566A77yM5Y2z5Y+v55yL5Ye65LuW5Lus6YO95piv5ZCM5YiG5q+N77yM54S25ZCO6L+b6KGM6L+Q566X5Y2z5Y+vLjwvcD4=
- 答案：Qg==
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
本课配套习题挑战模式5/5
单选题
难度系数：
5.
+……+
的值是（ ）
+……+的值是（ ） A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 答案：Qg==
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
