2y²+2y-3=0
(2y+3)(y-1)=0
y1=-3/2,y2=1
明白请采纳,
有新问题请求助,那2（x-1）平方=x平方-1怎么做2(x-1)²=x²-12x²-4x+2=x²-1x²-4x+3=0(x-1)(x-3)=0x1=1，x2=3