题目内容
解方程
X-
| 2X+
| 70%X+20%X=3.6. |
(1)X-
| 2 |
| 7 |
| 3 |
| 4 |
| 5 |
| 7 |
| 3 |
| 4 |
| 5 |
| 7 |
| 5 |
| 7 |
| 3 |
| 4 |
| 5 |
| 7 |
X=
| 21 |
| 20 |
(2)2X+
| 2 |
| 5 |
| 3 |
| 5 |
2X+
| 2 |
| 5 |
| 2 |
| 5 |
| 3 |
| 5 |
| 2 |
| 5 |
2X=
| 1 |
| 5 |
2X÷2=
| 1 |
| 5 |
X=
| 1 |
| 10 |
(3)70%X+20%X=3.6,
0.9X=3.6,
0.9X÷0.9=3.6÷0.9,
X=4.
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