题目内容
解方程
2x×
|
|
4-2x=
|
|
(1)2x×
=16,
2x×
÷
=16÷
,
2x=
,
2x÷2=
÷2,
x=
;
(2)
÷x=2
,
÷x×x=2
×x,
2
×x=
,
2
×x÷2
=
÷2
,
x=
;
(3)4-2x=
,
4-2x+2x=
+2x,
+2x=4,
+2x-
=4-
,
2x=
,
2x÷2=
÷2,
x=
;
(4)
x=
,
x÷
=
÷
,
x=
.
| 14 |
| 15 |
2x×
| 14 |
| 15 |
| 14 |
| 15 |
| 14 |
| 15 |
2x=
| 120 |
| 7 |
2x÷2=
| 120 |
| 7 |
x=
| 60 |
| 7 |
(2)
| 1 |
| 4 |
| 2 |
| 5 |
| 1 |
| 4 |
| 2 |
| 5 |
2
| 2 |
| 5 |
| 1 |
| 4 |
2
| 2 |
| 5 |
| 2 |
| 5 |
| 1 |
| 4 |
| 2 |
| 5 |
x=
| 5 |
| 48 |
(3)4-2x=
| 7 |
| 3 |
4-2x+2x=
| 7 |
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
2x=
| 5 |
| 3 |
2x÷2=
| 5 |
| 3 |
x=
| 5 |
| 6 |
(4)
| 5 |
| 3 |
| 3 |
| 5 |
| 5 |
| 3 |
| 5 |
| 3 |
| 3 |
| 5 |
| 5 |
| 3 |
x=
| 9 |
| 25 |
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