中学生网络课堂本课配套习题挑战模式1/4
单选题
难度系数：
1.等差数列：
的第
项是
的第项是 A:  |
B: |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：IOetieW3ruaVsOWIl+eahOmAmumhueWFrOW8jzxpbWcgd2lkdGg9MTE3IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzJGLzFGL3JCQUNKbFNqbXhqQy1PSW1BQUFDZlE1MncybzM0MS5wbmciPg==
- 提示2：IOaxguWHujxpbWcgd2lkdGg9MTQgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvOTAvMjgvckJBQ0ZGU2pteG5Dd1ZBOUFBQUJRRDdES2lRNTAzLnBuZyI+5ZKMPGltZyB3aWR0aD04IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzJGLzVEL3JCQUNKMVNqbXhtREU1MHdBQUFCSFBjYktDdzY3MC5wbmciPg==
- 提示3：IOS7o+WFpeWFrOW8j+axguinow==
- 答案：Qw==
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
本课配套习题挑战模式2/4
单选题
难度系数：
2.已知在等差数列
中，
则
中，则 A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：IOWIqeeUqOWFrOW8jzxpbWcgd2lkdGg9NjAgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvOTAvMjgvckJBQ0ZGU2pteHl4OVh0QkFBQUNNaW5pZ25nNzA1LnBuZyI+
- 提示2：IOaKiuW3suefpemHj+S7o+WFpQ==
- 答案：RA==
4oi1PGltZyB3aWR0aD0xMDkgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvOTAvMjgvckJBQ0ZGU2pteHp3aHhlZEFBQUNKQk9jM1p3Mjg1LnBuZyI+PGJyPuS7o+WFpeWFrOW8jzxpbWcgd2lkdGg9NjAgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvOTAvMjgvckJBQ0ZGU2pteHl4OVh0QkFBQUNNaW5pZ25nNzA1LnBuZyI+77yM5b6XPGJyPjxpbWcgd2lkdGg9MTQ3IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzJGLzFGL3JCQUNKbFNqbXh5RFQyNUFBQUFDODM4cHE0azA0MS5wbmciPi48YnI+4oi06YCJRDxicj48YnI+
本课配套习题挑战模式3/4
单选题
难度系数：
3.
已知等差数列中，
,
,则
是该数列的第几项
| A: 198 |
| B: 199 |
| C: 200 |
| D: 201 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+562J5beu5pWw5YiX55qE6YCa6aG55YWs5byPPGltZyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzkwLzI4L3JCQUNGRlNqbXhtU3dNaGpBQUFDWmpLUm1JazU4Ni5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvOTAvMjgvckJBQ0ZGU2pteG1Td01oakFBQUNaaktSbUlrNTg2LnBuZyIgaGVpZ2h0PSIyMSIgd2lkdGg9IjExNiI+PC9wPg==
- 提示2：PHA+5Luj5YWl5bey55+l6YeP77yM6Kej5pa556iLPC9wPg==
- 答案：Qw==
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
本课配套习题挑战模式4/4
单选题
难度系数：
4.在等差数列中，
，则
的值为
中，，则的值为 A:  |
| B: 15 |
C:  |
| D: 19 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOWFiOaxguWHuuWFrOW3rjxpbWcgd2lkdGg9OCBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8yRi81RC9yQkFDSjFTam14bURFNTB3QUFBQkhQY2JLQ3c2NzAucG5nIj4=
- 提示2：IOWIqeeUqOWFrOW8jzxpbWcgd2lkdGg9MTI0IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzJGLzFGL3JCQUNKbFNqbXl2VDFNeFJBQUFDZmlYQ1NrazUwNi5wbmciPuaxguinow==
- 答案：Qw==
4oi1PGltZyB3aWR0aD0xMDQgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvOTAvMjgvckJBQ0ZGU2pteXZTZy1uc0FBQUNEeFFwanpnMjUxLnBuZyI+77yMPGJyPuKItDxpbWcgd2lkdGg9MTM3IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzJGLzVFL3JCQUNKMVNqbXl2VEQwMlNBQUFDc1ZxTUxLVTI3NC5wbmciPu+8jDxicj7lj4jiiLU8aW1nIHdpZHRoPTEyNCBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yRi8xRi9yQkFDSmxTam15dlQxTXhSQUFBQ2ZpWENTa2s1MDYucG5nIj7vvIw8YnI+4oi0PGltZyB3aWR0aD0yMTAgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvOTAvMjgvckJBQ0ZGU2pteXV5NkVFbEFBQURQRm9xdFpvNjQ5LnBuZyI+Ljxicj7mlYXpgIlDPGJyPjxicj48YnI+
