题目内容
解方程.
x-
|
x×
|
|
(1)x-
x=
,
x=
,
x×
=
×
,
x=
;
(2)x×
×
=
,
x=
,
x×21=
×21,
x=12;
(3)
-4x=
,
-4x+4x=
+4x,
-
=
+4x-
,
÷4=4x÷4,
x=
.
| 1 |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
| 4 |
| 3 |
| 3 |
| 8 |
| 4 |
| 3 |
x=
| 1 |
| 2 |
(2)x×
| 2 |
| 3 |
| 1 |
| 14 |
| 4 |
| 7 |
| 1 |
| 21 |
| 4 |
| 7 |
| 1 |
| 21 |
| 4 |
| 7 |
x=12;
(3)
| 3 |
| 4 |
| 1 |
| 6 |
| 3 |
| 4 |
| 1 |
| 6 |
| 3 |
| 4 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 6 |
| 7 |
| 12 |
x=
| 7 |
| 48 |
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