题目内容
解方程.
| 3x-14×2=11 |
|
|
(1)3x-14×2=11,
3x-28=11,
3x-28+28=11+28,
3x÷3=39÷3,
x=13;
(2)
+
+x=
,
+x=
,
+x-
=
-
,
x=
;
(3)
-x=
,
-x+x=
+x,
+x-
=
-
,
x=
.
3x-28=11,
3x-28+28=11+28,
3x÷3=39÷3,
x=13;
(2)
| 1 |
| 7 |
| 1 |
| 2 |
| 2 |
| 3 |
| 9 |
| 14 |
| 2 |
| 3 |
| 9 |
| 14 |
| 9 |
| 14 |
| 2 |
| 3 |
| 9 |
| 14 |
x=
| 1 |
| 42 |
(3)
| 3 |
| 4 |
| 3 |
| 10 |
| 3 |
| 4 |
| 3 |
| 10 |
| 3 |
| 10 |
| 3 |
| 10 |
| 3 |
| 4 |
| 3 |
| 10 |
x=
| 9 |
| 20 |
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