设f(x)= 1-x分之x 求f[(fx)]和f{f[f(x)]}
问题描述:
设f(x)= 1-x分之x 求f[(fx)]和f{f[f(x)]}
答
f[(fx)]=1-f(x)=1-(1-x)=x
f{f[f(x)]} =1-f[f(x)]=1-x