题目内容
解方程,要写出必要的过程.
(1)2x-
| (2)(1-
| (3)
| (4)
|
(1)2x-
| 3 |
| 5 |
| 3 |
| 5 |
2x-
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
2x=1,
2x÷2=1÷2,
x=0.5;
(2)(1-
| 4 |
| 9 |
| 3 |
| 4 |
(1-
| 4 |
| 9 |
| 3 |
| 4 |
| 5 |
| 9 |
| 5 |
| 9 |
| 5 |
| 9 |
| 5 |
| 9 |
x=81;
(3)
| 10 |
| x |
| 2.5 |
| 0.8 |
2.5x=10×0.8,
2.5x=8,
2.5x÷2.5=8÷2.5,
x=3.2;
(4)
| 2 |
| 3 |
| 3 |
| 4 |
| 5 |
| 3 |
| 3 |
| 4 |
| 5 |
| 3 |
| 5 |
| 3 |
| 3 |
| 4 |
| 5 |
| 3 |
x=
| 9 |
| 20 |
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