X-5X%=17.5 7X+5×0.7=8 3X÷5=48 40-X=3.
问题描述:
X-5X%=17.5
7X+5×0.7=8
3X÷5=48
40-X=3.
答
(1)X-5X%=17.5, (1-0.05)X=17.5, 0.95X=17.5, 0.95X÷0.95=17.5÷0.95, ...