1080/x-1080/x+10=9
120/x - 120/(x+10)=1
120(x+10) - 120x = x(x+10)
120x + 1200 - 120x = x^2 +10x
x^2 +10x -1200=0
(x+40)(x-30)=0
x1=-40,x2=30,
肯定对噢
1080/x-1080/x+10=9
120/x - 120/(x+10)=1
120(x+10) - 120x = x(x+10)
120x + 1200 - 120x = x^2 +10x
x^2 +10x -1200=0
(x+40)(x-30)=0
x1=-40,x2=30,
肯定对噢