12+60%x=48 x-25%x=25 30%x+45%x=27 (1+40%)x=7

问题描述:

12+60%x=48 x-25%x=25 30%x+45%x=27 (1+40%)x=7

12+60%x=48
0.6x=36
x=60
x-25%x=25
0.75x=25
x=100/3
30%x+45%x=27
0.75x=27
x=36
(1+40%)x=7
1.4x=7
x=5