(1/x+2)+(1/x+8)= (1/x+4)+(1/x+6)求解,要过程,速度~

问题描述:

(1/x+2)+(1/x+8)= (1/x+4)+(1/x+6)求解,要过程,速度~

(1/x+2)+(1/x+8)= (1/x+4)+(1/x+6)
1/(x+2)-1/(x+4)=1/(x+6)-1/(x+8)
[(x+4)-(x+2)]/(x+2)(x+4)=[(x+8)-(x+6)]/(x+6)(x+8)]
2/(x+2)(x+4)=2/(x+6)(x+8)
(x+6)(x+8)=(x+2)(x+4)
x² +14x+48=x²+6x+8
8x=-40
x=-5
检验: