题目内容
1
| (1+
| x-
| x×2
|
(1)1
-3x=
,
1
-3x+3x=
+3x,
+3x-
=1
-
,
3x÷3=
÷3,
x=
;
(2)(1+
)x=28,
x=28,
x×
=28×
,
x=20;
(3)x-
x=1
,
x=1
,
x×
=1
×
,
x=1
;
(4)x×2
=8
,
x×2
÷2
=8
÷2
,
x=
.
| 1 |
| 4 |
| 1 |
| 2 |
1
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 2 |
3x÷3=
| 3 |
| 4 |
x=
| 1 |
| 4 |
(2)(1+
| 2 |
| 5 |
| 7 |
| 5 |
| 7 |
| 5 |
| 5 |
| 7 |
| 5 |
| 7 |
x=20;
(3)x-
| 2 |
| 7 |
| 1 |
| 14 |
| 5 |
| 7 |
| 1 |
| 14 |
| 5 |
| 7 |
| 7 |
| 5 |
| 1 |
| 14 |
| 7 |
| 5 |
x=1
| 1 |
| 2 |
(4)x×2
| 1 |
| 5 |
| 1 |
| 2 |
x×2
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 2 |
| 1 |
| 5 |
x=
| 85 |
| 22 |
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