题目内容
解方程.
| x:15=2. |
解;(1)
x=
,
x×
=
×
,
x=
;
(2)x:15=2,
x×
×15=2×15,
x=30;
| 7 |
| 8 |
| 21 |
| 40 |
| 7 |
| 8 |
| 8 |
| 7 |
| 21 |
| 40 |
| 8 |
| 7 |
x=
| 3 |
| 5 |
(2)x:15=2,
x×
| 1 |
| 15 |
x=30;
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题目内容
| x:15=2. |
| 7 |
| 8 |
| 21 |
| 40 |
| 7 |
| 8 |
| 8 |
| 7 |
| 21 |
| 40 |
| 8 |
| 7 |
| 3 |
| 5 |
| 1 |
| 15 |