4-x=2(-0.5x²+2.5x-2)

问题描述:

4-x=2(-0.5x²+2.5x-2)


4-x=2(-0.5x²+2.5x-2)
4-x=-x²+5x-4
x²-6x+8=0
(x-4)(x-2)=0
∴x=4或x=2