若f（x）=x²-根号2,则f【f（根号2）】等于?

网友回答

∵f(x)=x²-√2
∴f﹙√2﹚=﹙√2﹚²-√2
=2-√2则f[f(√2)=f(2-√2)
=(2-√2)²-√2
=4-4√2 +2-√2
=6-5√2
======以下答案可供参考======
供参考答案1:
f(√2)=（√2）²-√2 =2-√2
则f[f(根号2)]=f(2-√2)=(2-√2)²-√2=4-4√2 +2-√2=6-5√2
供参考答案2:
6-5根号2是对的
供参考答案3:
f(x)=x²-√2
f(√2)=(√2)²-√2
=2-√2f(f(√2))=(2-√2)²-√2
=4+2-4√2-√2
=6-5√2