若f(2x-1)=x^2-3x+1,则f(-2)=?
问题描述:
若f(2x-1)=x^2-3x+1,则f(-2)=?
答
2x-1=y,x=(1+y)/2,f(y)=(1+y)(1+y)*1/4-3(1+y)/2+1.f(-2)=1/4+3/2+1=11/4
若f(2x-1)=x^2-3x+1,则f(-2)=?
2x-1=y,x=(1+y)/2,f(y)=(1+y)(1+y)*1/4-3(1+y)/2+1.f(-2)=1/4+3/2+1=11/4