题目内容
解方程:
x-
+
=
;
+x=
;
12x-9x=8.7.
x-
| 5 |
| 6 |
| 1 |
| 6 |
| 1 |
| 9 |
| 1 |
| 2 |
| 5 |
| 6 |
12x-9x=8.7.
(1)x-
+
=
x-
=
,
x-
+
=
+
,
x=
+
,
x=
;
(2)
+x=
+x-
=
-
,
x=
-
,
x=
;
(3)12x-9x=8.7
(12-9)x=8.7,
3x=8.7,
3x÷3=8.7÷3,
x=2.9.
| 5 |
| 6 |
| 1 |
| 6 |
| 1 |
| 9 |
x-
| 2 |
| 3 |
| 1 |
| 9 |
x-
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 9 |
| 2 |
| 3 |
x=
| 1 |
| 9 |
| 6 |
| 9 |
x=
| 7 |
| 9 |
(2)
| 1 |
| 2 |
| 5 |
| 6 |
| 1 |
| 2 |
| 1 |
| 2 |
| 5 |
| 6 |
| 1 |
| 2 |
x=
| 5 |
| 6 |
| 3 |
| 6 |
x=
| 1 |
| 3 |
(3)12x-9x=8.7
(12-9)x=8.7,
3x=8.7,
3x÷3=8.7÷3,
x=2.9.
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