6x/x方-1 + 5/x-1 = x+4/x+1
问题描述:
6x/x方-1 + 5/x-1 = x+4/x+1
答
6x/x方-1 + 5/x-1 = x+4/x+1 两边同乘(x+1)(x-1)
6x+5(x+1)=(x+4)(x-1)
6x+5x+5=x^2+3x-4
x^2-8x-9=0
(x-9)(x+1)=0
x1=9 x2=-1 (舍)