题目内容
| 我会解方程. 3x-
| x+
| ||||||||
x-
|
|
(1)3x-
=
,
3x-
+
=
+
,
3x=
,
3x÷3=
÷3,
x=
;
(2)x+
x=42,
x=42,
x×
=42×
,
x=36;
(3)x-
x=32,
x=32,
x×
=32×
,
x=40;
(4)
+
x=
,
+
x-
=
-
,
x=
,
x×4=
×4,
x=
.
| 1 |
| 3 |
| 1 |
| 6 |
3x-
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 3 |
3x=
| 1 |
| 2 |
3x÷3=
| 1 |
| 2 |
x=
| 1 |
| 6 |
(2)x+
| 1 |
| 6 |
| 7 |
| 6 |
| 7 |
| 6 |
| 6 |
| 7 |
| 6 |
| 7 |
x=36;
(3)x-
| 1 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
| 5 |
| 4 |
| 5 |
| 4 |
x=40;
(4)
| 5 |
| 16 |
| 1 |
| 4 |
| 3 |
| 2 |
| 5 |
| 16 |
| 1 |
| 4 |
| 5 |
| 16 |
| 3 |
| 2 |
| 5 |
| 16 |
| 1 |
| 4 |
| 19 |
| 16 |
| 1 |
| 4 |
| 19 |
| 16 |
x=
| 19 |
| 4 |
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