Question

1,已知f（x）=x2+m,g(x)=f[f(x)],求g(x)的解析式.

Answer 1

1 f(f(x))=x^4+2mx^2+m^2+m

2 B={29,30,31}

f(1)=31 f(2)=29 f(7)=31 f(8)=31 f(11)=30