【单选题】Since William had been seriously ill for several months, his parents were worried about ________ to return to school full-time. A. he wanted B. he wanting C. him to want D. his wanting
【简答题】有以下4个命题: ①函数f(x)= a x (a>0且a≠1)与函数g(x)='log' a a x (a>0且a≠1)的定义域相同; ②函数f(x)=x 3 与函数g(x)='3' x 的值域相同; ③函数f(x)=(x-1) 2 与g(x)='2' x -1 在(0,+∞)上都是增函数; ④如果函数f(x)有反函数f -1 (x),则f(x+1)的反函数是f -1 (x+1). 其中 的题号为
【简答题】有以下4个命题: ①函数f(x)=a x (a>0且a≠1)与函数g(x)=log a a x (a>0且a≠1)的定义域相同; ②函数f(x)=x 3 与函数g(x)=3 x 的值域相同; ③函数f(x)=(x-1) 2 与g(x)=2 x-1 在(0,+∞)上都是增函数; ④如果函数f(x)有反函数f -1 (x),则f(x+1)的反函数是f -1 (x+1). 其中不正确的题号为______...
【简答题】对于定义在区间[m,n]上的两个函数f(x)和g(x),如果对任意的x∈[m,n],均有不等式|f(x)-g(x)|≤1成立,则称函数f(x)与g(x)在[m,n]上是“友好”的,否则称“不友好”的.现在有两个函数f(x)=log a (x-3a)与 g(x)=lo g a 1 x-a (a>0,a≠1),给定区间[a+2,a+3]. (1)若f(x)与g(x)在区间[a+2,a+3]上都有意义,...