题目内容
解方程.
x+
x=
X÷
=12
5X-3×
=
.
x+
| 7 |
| 9 |
| 4 |
| 3 |
| 2 |
| 3 |
| 1 |
| 4 |
5X-3×
| 5 |
| 21 |
| 5 |
| 7 |
(1)x+
x=
,
(1+
)x=
,
x=
,
x×
=
×
,
x=
;
(2)
X÷
=12,
X÷
×4=12×4,
X=48,
X×
=48×
,
X=72;
(3)5X-3×
=
,
5X-
=
,
5X-
+
=
+
,
5X=
,
5X÷5=
÷5,
X=
.
| 7 |
| 9 |
| 4 |
| 3 |
(1+
| 7 |
| 9 |
| 4 |
| 3 |
| 16 |
| 9 |
| 4 |
| 3 |
| 16 |
| 9 |
| 9 |
| 16 |
| 4 |
| 3 |
| 9 |
| 16 |
x=
| 3 |
| 4 |
(2)
| 2 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
| 2 |
| 3 |
| 3 |
| 2 |
| 3 |
| 2 |
X=72;
(3)5X-3×
| 5 |
| 21 |
| 5 |
| 7 |
5X-
| 5 |
| 7 |
| 5 |
| 7 |
5X-
| 5 |
| 7 |
| 5 |
| 7 |
| 5 |
| 7 |
| 5 |
| 7 |
5X=
| 10 |
| 7 |
5X÷5=
| 10 |
| 7 |
X=
| 2 |
| 7 |
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