题目内容
解方程.
40%X-25%X=130
x-
x=
1-25%x=0.5.
40%X-25%X=130
x-
| 3 |
| 5 |
| 6 |
| 5 |
1-25%x=0.5.
(1)40%X-25%X=130,
15%x=130,
15%x÷15%=130÷15%,
x=866
;
(2)x-
x=
,
x÷
=
÷
,
x=3;
(3)1-25%x=0.5,
1-25%x+25%x=0.5+25%x,
1-0.5=0.5+25%x-0.5,
0.5÷25%=25%x÷25%,
x=2.
15%x=130,
15%x÷15%=130÷15%,
x=866
| 2 |
| 3 |
(2)x-
| 3 |
| 5 |
| 6 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
| 6 |
| 5 |
| 2 |
| 5 |
x=3;
(3)1-25%x=0.5,
1-25%x+25%x=0.5+25%x,
1-0.5=0.5+25%x-0.5,
0.5÷25%=25%x÷25%,
x=2.
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