Question

180(3-x)/x=80x/3-x怎么解？

Answer 1

80x方=180（3-x）方
80x方=180（9+x方-6x）
80x方=1620+180x方-1080x
100x方-1080x+1620=0
5x方+54x+81=0
x+9=0或5x+9=0
x=-9或x=-9/5

Answer 2

180(3－x)/x＝80x/(3－ⅹ)
80x²＝180(3－ⅹ)²
4x²＝9(9－6x＋x²)
4ⅹ²＝81－54x＋9ⅹ²
5ⅹ²－54x＋81＝0
(x－9)(5x－9)＝0
x1＝9 x2＝9/5