本课配套习题挑战模式1/4

返回课程
单选题
难度系数:

1.等差数列:的第项是
A:
B:
C:
D:
  • 提示1IOetieW3ruaVsOWIl+eahOmAmumhueWFrOW8jzxpbWcgd2lkdGg9MTE3IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzJGLzFGL3JCQUNKbFNqbXhqQy1PSW1BQUFDZlE1MncybzM0MS5wbmciPg==
  • 提示2IOaxguWHujxpbWcgd2lkdGg9MTQgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvOTAvMjgvckJBQ0ZGU2pteG5Dd1ZBOUFBQUJRRDdES2lRNTAzLnBuZyI+5ZKMPGltZyB3aWR0aD04IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzJGLzVEL3JCQUNKMVNqbXhtREU1MHdBQUFCSFBjYktDdzY3MC5wbmciPg==
  • 提示3IOS7o+WFpeWFrOW8j+axguinow==