设f (x)={2x+1(x≥0),x²+4(x
问题描述:
设f (x)={2x+1(x≥0),x²+4(x
答
题目是替换变量,就是把x变成x-1,或者x+1
由于f (x)={2x+1(x≥0),x²+4(x