题目内容
解方程:
(1)1
×7+4x=7x-
(2)
:
=(x-28):
.
(1)1
| 7 |
| 14 |
| 3 |
| 4 |
(2)
| 5 |
| 8 |
| 5 |
| 28 |
| 2 |
| 3 |
(1)1
×7+4X=7X-
,
+4X=7X-
,
3X-
=
,
3X=
,
X=3
;
(2)
:
=(X-28):
,
(X-28)=
×
,
X-5=
,
X=
,
X=30
.
| 7 |
| 14 |
| 3 |
| 4 |
| 21 |
| 2 |
| 3 |
| 4 |
3X-
| 3 |
| 4 |
| 21 |
| 2 |
3X=
| 45 |
| 4 |
X=3
| 3 |
| 4 |
(2)
| 5 |
| 8 |
| 5 |
| 28 |
| 2 |
| 3 |
| 5 |
| 28 |
| 5 |
| 8 |
| 2 |
| 3 |
| 5 |
| 28 |
| 5 |
| 12 |
| 5 |
| 28 |
| 65 |
| 12 |
X=30
| 1 |
| 3 |
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