题目内容
解方程。
30%x+45%x=27
x-25%x=24
=
30%x+45%x=27
x-25%x=24
解:(1)30%x+45%x=27,
0.75x=27,
0.75x÷0.75=27÷0.75,
x=36;
(2)x-25%x=24,
0.75x=24,
0.75x÷0.75=24÷0.75,
x=32;
(3)
=
,
0.25x=1.25×1.6,
0.25x÷0.25=2÷0.25,
x=8。
0.75x=27,
0.75x÷0.75=27÷0.75,
x=36;
(2)x-25%x=24,
0.75x=24,
0.75x÷0.75=24÷0.75,
x=32;
(3)
0.25x=1.25×1.6,
0.25x÷0.25=2÷0.25,
x=8。
练习册系列答案
相关题目
解方程.
| 30%x=9 | 40%x+50%x=7.2 | x-30%x=1.4. |