1/x+1/(x+10)=1/12

问题描述:

1/x+1/(x+10)=1/12

1/x+1/(x+10)=1/12
x+10+x=x(x+10)/12
24x+120=x^2+10x
x^2-14x-120=0
(x-20)(x+6)=0
x=20或x=-6