题目内容
解方程.
12a-9a=8.7
x-
=
x+
=
.
12a-9a=8.7
x-
| 5 |
| 6 |
| 1 |
| 9 |
x+
| 1 |
| 4 |
| 4 |
| 5 |
(1)12a-9a=8.7,
3a=8.7,
3a÷3=8.7÷3,
a=2.9;
(2)x-
| 5 |
| 6 |
| 1 |
| 9 |
x-
| 5 |
| 6 |
| 5 |
| 6 |
| 1 |
| 9 |
| 5 |
| 6 |
x=
| 17 |
| 18 |
(3)x+
| 1 |
| 4 |
| 4 |
| 5 |
x+
| 1 |
| 4 |
| 1 |
| 4 |
| 4 |
| 5 |
| 1 |
| 4 |
x=
| 11 |
| 20 |
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