(x-3)的方+4x(x-3)=0怎么解
问题描述:
(x-3)的方+4x(x-3)=0怎么解
答
(x-3)^2+4x(x-3)=0
x^2-6x+9+4x^2-12x=0
5x^2-18x+9=0
(5x-3)(x-3)=0
5x-3=0
x=3/5
x-3=0
x=3