求1/(x+4)-1/(x+7)=1/(x+3)-1/(x+6)的值
问题描述:
求1/(x+4)-1/(x+7)=1/(x+3)-1/(x+6)的值
答
1/(x+3)-1/(x+4)=1/(x+6)-1/(x+7)
(x+6)(x+7)=(x+3)(x+4)
6x=-30
x=-5