解方程 x-百分之15x=34 x+百分之20x=46.2 9.8-(1+百分之30)x=0.7
问题描述:
解方程 x-百分之15x=34 x+百分之20x=46.2 9.8-(1+百分之30)x=0.7
答
(1) x-15%x=34
85%x=34
x=34÷85%
x=40
(2) x+20%x=46.2
1.2x=46.2
x=38.5
(3) 9.8-(1+30%)x=0.7
x=7