f(x)=5x-3.求f(f(4)).

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f(x)=5x-3.求f(f(4)).
f(x)=5x-3.求f(f(4)).

f(x)=5x-3.求f(f(4)).
f(4)=5*4-3=17
f(f(4))=f(17)=5*17-3=82

f(4)=17,f(17)=82