(1000x+1000-440)(x+1)=624
两边除以8
(125x+70)(x+1)=78
125x²+195x-8=0
(25x-1)(5x+8)=0
x=1/25,x=-8/5
[1000(1+x)-440](1+x)=624怎样化简
(1000x+1000-440)(x+1)=624
两边除以8
(125x+70)(x+1)=78
125x²+195x-8=0
(25x-1)(5x+8)=0
x=1/25,x=-8/5