简单得数学题,急死了啊!!!

来源:百度知道 编辑:UC知道 时间:2024/06/08 12:19:35
X-10%X=18
X+30%X=52
(1-25)%X=36 解题要详细!
19-120%X=7
2X+30%X=9.2

X-10%X=18
X*100%-X*10%=18
X*90%=18
X=18*(100/90)
X=20

X+30%X=52
100%X+30%X=52
130%X=52
X=52*(100/130)
X=40

(1-25)%X=36
(-24)%X=36
X=36*(-100/24)
X=-150

19-120%X=7
120%X=19-7
X=12*(100/120)
X=10

2X+30%X=9.2
200%X+30%X=9.2
230%X=9.2
X=9.2*(100/230)
X=92/23

X-10%X=18
x(1-10%)=18
x=18/0.9
x=20

X+30%X=52
x(1+30%)=52
x=52/1.3
x=4
(1-25)%X=36 ?
(1-25%)X=36
x=36/75%
x=36/0.75
x=48

x=18/0.9=20
x=52/1.3=40
x=-36/0.24=-150