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.在等差数列{
n}中， 1+5=16，则3等于（ ）
n}中， 1+5=16，则3等于（ ） | A: 8 |
| B: 4 |
| C: -4 |
| D: -8 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOWIqeeUqOetieW3ruaVsOWIl+eahOaAp+i0qDI8aW1nIHdpZHRoPTE0IGhlaWdodD0xNiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzgwL0Q0L3JCQUNFMU0xTjctVGR2cnVBQUFCSERIT0Rsbzk2Ni5wbmciPjxzdWI+Mzwvc3ViPj08aW1nIHdpZHRoPTE0IGhlaWdodD0xNiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzgwL0Q0L3JCQUNFMU0xTjctVGR2cnVBQUFCSERIT0Rsbzk2Ni5wbmciPjxzdWI+MTwvc3ViPis8aW1nIHdpZHRoPTE0IGhlaWdodD0xNiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzgwL0Q0L3JCQUNFMU0xTjctVGR2cnVBQUFCSERIT0Rsbzk2Ni5wbmciPjxzdWI+NTwvc3ViPg==
- 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△ABC中，三内角A、B、C成等差数列，则sinB=（ ）
A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：IOeUsemimOaEj+WPr+W+l0ErQz0yQu+8jOe7k+WQiOS4ieinkuW9oueahOWGheinkuWSjOWPr+axgkLvvIzov5vogIzlj6/msYJzaW5C
- 答案：Qg==
6Kej77ya55Sx6aKY5oSP5Y+v5b6X77yMQStDPTJCPGJyPuKItUErQitDPTE4MMKwPGJyPuKItEI9NjDCsO+8jHNpbkI9PGltZyB3aWR0aD0yOCBoZWlnaHQ9NDYgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC84MC9ENC9yQkFDRTFNMU44V1Iwd0JHQUFBQnlndThVTlE5NjIucG5nIj48YnI+5pWF6YCJQg==
本课配套习题挑战模式3/5
单选题
难度系数：
3.已知等差数列{
n}中， 5+9=2，则S13=（ ）
n}中， 5+9=2，则S13=（ ） | A: 11 |
| B: 12 |
| C: 13 |
| D: 14 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 答案：Qw==
6Kej77ya4oi15Zyo562J5beu5pWw5YiXezxpbWcgd2lkdGg9MTQgaGVpZ2h0PTE2IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvODEvMTcvckJBQ0UxTTFRNnVUX0J4LUFBQUJIRXVlMGVvNDUzLnBuZyI+PHN1Yj5uPC9zdWI+feS4rSw8aW1nIHdpZHRoPTk3IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzgxLzE3L3JCQUNFMU0xUTY3aEd3S3RBQUFET2tzVWhFczkyNy5wbmciPiA8YnI+4oi0PGltZyB3aWR0aD0yNzQgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNUQvNEMvckJBQ0ZGTTFRNjdRalJZcEFBQUZQV280M2NFNTQ2LnBuZyI+PGJyPuaVhemAiUM=
本课配套习题挑战模式4/5
单选题
难度系数：
4.已知等差数列{n}中，S10=120，那么2+9等于（ ）
n}中，S10=120，那么2+9等于（ ） | A: 12 |
| B: 24 |
| C: 36 |
| D: 48 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNruetieW3ruaVsOWIl+WJjW7pobnlkoznmoTlhazlvI/msYLlh7pTPHN1Yj4xMDwvc3ViPueahOihqOi+vuW8jw==
- 提示2：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
- 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.无穷多个正整数组成（公差不为零的）等差数列，则此数列中（ ）
| A: 必有一项为完全平方数 |
| B: 必有两项为完全平方项 |
| C: 不能有三项为完全平方项 |
| D: 若有平方项，则有无穷多项为完全平方项 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOWPr+eUqOeJueWAvOazleino+WGsw==
- 答案：RA==
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
