若2x^2-6x+1=o,则6+3x-x^2=
问题描述:
若2x^2-6x+1=o,则6+3x-x^2=
kuai ,
答
13/2
2x^2-6x+1=0 那么2x^2-6x=-1,即x^2-3x=-1/2,3x-x^2=1/2
6+3x-x^2=6+1/2=13/2