挑战习题
1/3单选题
难度:

1.根据单调性的定义,函数在区间上是(    )
A 增函数
B 减函数
C 既不是增函数也不是减函数
D 无法判断
提示1:
IDxpbWcgd2lkdGg9Mjc2IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzhGLzc1L3JCQUNGRlBySFdYVGdKRmVBQUFFMjBCR081MDMzOS5wbmciPg==
提示2:
IDxpbWcgd2lkdGg9Mjg0IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0M5LzVFL3JCQUNFMVBySFdXUTZjNEJBQUFFc2ttU2ZHYzAxNi5wbmciPg==
提示3:
IDxpbWcgd2lkdGg9MjIyIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0M5LzVFL3JCQUNFMVBySFdYQUZsQXFBQUFFWUNsMjNsYzE0Ny5wbmciPg==
正确答案:QQ==
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