题目内容
解方程
x-
| 2.2x+3.3x=66 | x-
| ||||||||
| 7m-2m=12.5 |
| 9x+7=21.4. |
(1)x-
| 1 |
| 3 |
| 1 |
| 2 |
x-
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
x=
| 5 |
| 6 |
(2)2.2x+3.3x=66,
5.5x=66,
5.5x÷5.5=66÷5.5,
x=12;
(3)x-
| 1 |
| 6 |
| 7 |
| 9 |
x-
| 1 |
| 6 |
| 1 |
| 6 |
| 7 |
| 9 |
| 1 |
| 6 |
x=
| 17 |
| 18 |
(4)7m-2m=12.5,
5m=12.5,
5m÷5=12.5÷5,
m=2.5;
(5)
| 1 |
| 2 |
| 3 |
| 8 |
x=
| 1 |
| 2 |
| 3 |
| 8 |
x=
| 1 |
| 8 |
(6)9x+7=21.4,
9x+7-7=21.4-7,
9x=14.4,
9x÷9=14.4÷9,
x=1.6.
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