2x(x-3)-(x+6)(x-3)=x2+12 解方程.
问题描述:
2x(x-3)-(x+6)(x-3)=x2+12 解方程.
答
2x(x-3)-(x+6)(x-3)=x²+12
提取x-3
(2x-x-6)(x-3)=x²+12
(x-6)(x-3)=x²+12
x²-9x+18=x²+12
6-9x=0
9x=-6
x=-2/3