5x/(x+3)(x+2)+2x-5/(x-4)(x+3)=7x-70/(x+2)(x+4)yaoqiu方程结果,
问题描述:
5x/(x+3)(x+2)+2x-5/(x-4)(x+3)=7x-70/(x+2)(x+4)
yaoqiu方程结果,
答
方程两边同时乘以(x+3)(x+2)(x+4),
则方程变成5x(x+4)+(2x-5)(x+2)=(7x-70)(x+3)
3x^2+19x-10=7x^2+49x-210
2x^2+15x-100=0
(x+10)(2x-5)=0
所以x1=-10,x2=2.5