用分解因式法解一元二次方程的几道题帮帮忙
问题描述:
用分解因式法解一元二次方程的几道题帮帮忙
1.(X-2)^2=(2X+3)^2
2.(X-2)(X-3)=12
3.2X+6=(X+3)^2
4.2Y^2+4y^2=y+2
答
1 (X-2)^2=(2X+3)^2 (X-2)^2-(2X+3)^2=0 (3X+1)(-X-5)=0 X=-1/3或-5
2 X^2-5X+6=12 X^2-5X-6=0 (X-6)(X+1)=0 X=1,6
3 X^2+6X+9-2X-6=0 X^2+4X+3=0 (X+1)(X+3)=0 X=-1,-3
4 6Y^-Y-2=0 (3Y-2)(2Y+1)=0 Y=2/3,-1/2