0.5/4x-1.5-0.02/0.5x-0.08=0.1/1.2x+2,

问题描述:

0.5/4x-1.5-0.02/0.5x-0.08=0.1/1.2x+2,

求括号

0.5/4x-1.5-0.02/0.5x-0.08=0.1/1.2x+2
5/40x-15-2/50x-8=1/12x+20
1/8x-3-1/25x-4=1/12x+20
25x-4-8x+3/(8x-3)(25x-4)=1/12x+20
17x-1/(8x-3)(25x-4)=1/12x+20
(17x-1)(12x+2)=(8x-3)(25x-4)
204x^2+34x-12x-2=200x^2-32x-75x+12
4x^2+129x-14=0
用公式法解得
x=-129+√129^2+4*4*14/2*4=-129+√16865/8
或x=-129-√129^2+4*4*14/2*4=-129-√16865/8