解方程x-2/5＝3/4x=2/5+3/4x=8/20+15/20x=23/2
解方程:x-2/5=3/4x=3/4+2/5x=23/20
x-2/5=3/4解:x-2/5+2/5=3/4+2/5 x=8/20+15/20 x=23/20
