playing/play/played tennis有什么区别

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• 对定义在实数集上的函数f(x),若存在实数x0,使得f(x0)=x0,那么称x0为函数f(x)的一个不动点.1）已知函数f(x)=ax^2+bx-b(a≠0)有不动点（1,1）,（-3,-3）,求a,b2）若对于任意实数b,函数f(x)=ax^3+bx-b(a≠0)总有两个相异的不动点,求实数a的取值范围.