f(x)＝5x－3.求f(f(4)).
问题描述：
f(x)＝5x－3.求f(f(4)).
答
f(4)=5*4-3=17
f(f(4))=f(17)=5*17-3=82
f(x)＝5x－3.求f(f(4)).
f(4)=5*4-3=17
f(f(4))=f(17)=5*17-3=82