解方程. 19-12%x=7 2x+30%x=9.2 (1-25%)x=36 75%x+25=40 50%x=13/40 3/4x-50%x=17.5.
问题描述:
解方程. 19-12%x=7 |
2x+30%x=9.2 | (1-25%)x=36 | ||||
75%x+25=40 | 50%x=
|
|
答
(1)19-12%x=7 19-0.12x=7 19-0.12x+0.12x=7+0.12x 7+0.12x=19  ...