若f(x²+1)=3x²+2则f(x)=A 3X+2 B 3X-1 C 3X+2(X>=1) D 3x-1(X>=1)
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若f(x²+1)=3x²+2则f(x)=A 3X+2 B 3X-1 C 3X+2(X>=1) D 3x-1(X>=1)
若f(x²+1)=3x²+2则f(x)=
A 3X+2 B 3X-1 C 3X+2(X>=1) D 3x-1(X>=1)
若f(x²+1)=3x²+2则f(x)=A 3X+2 B 3X-1 C 3X+2(X>=1) D 3x-1(X>=1)
原式变为
f(x²+1)=3x²+2
=3X²+3-1
=3(x²+1)-1
则f(x)=3X-1
即选“B”