题目内容
解方程:
=
:
X-25%X=12.6.
| x |
| 21 |
| 4 |
| 9 |
| 1 |
| 6 |
(1)
=
:
,
x=21×
,
x×6=21×
×6,
x=56;
(2)X-25%X=12.6,
(1-25%)X=12.6,
75%X=12.6,
75%X÷75%=12.6÷75%,
X=12.6÷
,
X=12.6×
,
X=16.8.
| X |
| 21 |
| 4 |
| 9 |
| 1 |
| 6 |
| 1 |
| 6 |
| 4 |
| 9 |
| 1 |
| 6 |
| 4 |
| 9 |
x=56;
(2)X-25%X=12.6,
(1-25%)X=12.6,
75%X=12.6,
75%X÷75%=12.6÷75%,
X=12.6÷
| 3 |
| 4 |
X=12.6×
| 4 |
| 3 |
X=16.8.
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