由f1(x)=f(x)=ax+b,得到f2(x)=f(f1(x))=a(ax+b)+b=a2x+ab+b,
f3(x)=f(f2(x))=a[a(ax+b)+b]+b=a3x+a2b+ab+b,
同理f4(x)=f(f3(x))=a4x+a3b+a2b+ab+b,
则f5(x)=f(f4(x))=a5x+a4b+a3b+a2b+ab+b=32x+93,
即a5=32...
由f1(x)=f(x)=ax+b,得到f2(x)=f(f1(x))=a(ax+b)+b=a2x+ab+b,
f3(x)=f(f2(x))=a[a(ax+b)+b]+b=a3x+a2b+ab+b,
同理f4(x)=f(f3(x))=a4x+a3b+a2b+ab+b,
则f5(x)=f(f4(x))=a5x+a4b+a3b+a2b+ab+b=32x+93,
即a5=32...