解方程分步计算:X+50%X=8.5 (1—75%)x=42 20—20%X=3.6 30%X+15%X=27
问题描述:
解方程分步计算:X+50%X=8.5 (1—75%)x=42 20—20%X=3.6 30%X+15%X=27
答
(1) x+50%x=8.5
(1+50%)x=8.5
x=17/3
(2)(1-75%)x=42
25%x=42
x = 168
(3) 20-20%x=3.6
20%x=20-3.6
0.2x=16.4
x=82
(4)30%x+15%x=27
45%x = 27
x=60