用因式分解解(2x+3)平方-2x-3=0 (2x-1)平方-x平方=0 2y(2+y)=-(y+2) (y-1)平方+2y(y-1)=0
问题描述:
用因式分解解(2x+3)平方-2x-3=0 (2x-1)平方-x平方=0 2y(2+y)=-(y+2) (y-1)平方+2y(y-1)=0
答
(2x+3)平方-2x-3=0 (2x+3)(2x+3-1)=0x=-3/2或x=-1(2x-1)平方-x平方=0 [(2x-1)+x][(2x-1)-x]=0(3x-1)(x-1)=0x=1/3或x=12y(2+y)=-(y+2) (y+2)(2y+1)=0y=-2或y=-1/2(y-1)平方+2y(y-1)=0(y-1)(y-1+2y)=0(y-1)(...