2X^2-4X=2(X-1)
问题描述:
2X^2-4X=2(X-1)
,
答
两边除以2
x²-2x=x-1
x²-3x=-1
x²-3x+9/4=-1+9/4
(x-3/2)²=5/4
x-3/2=±√5/2
x=(3-√5)/2,x=(3+√5)/2