1 (1-1/4+1/5)X=95 (19/20)X=95 X=100
2 X=1.25:0.25X3.2=5X3.2=16
3 4/9+1.8=13x/9 13x=20.2 x=101/65
4 x÷(2÷3)=1 x=2/3
解方程一定要写解