题目内容
解方程.
X-
| 32-80%X=16 | 4÷
|
(1)X-
X=8,
X=8,
X÷
=8÷
,
X=32,
(2)32-80%X=16,
32-80%X+80%X=16+80%X,
16+80%X=32,
16+80%X-16=32-16,
0.8X=16,
0.8X÷0.8=16÷0.8,
X=20,
(3)4÷
X=
,
4÷
X×
X=
×
X,
×
X=4,
X=4,
X÷
=4÷
,
X=15,
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
X=32,
(2)32-80%X=16,
32-80%X+80%X=16+80%X,
16+80%X=32,
16+80%X-16=32-16,
0.8X=16,
0.8X÷0.8=16÷0.8,
X=20,
(3)4÷
| 2 |
| 3 |
| 2 |
| 5 |
4÷
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
| 2 |
| 3 |
| 2 |
| 5 |
| 2 |
| 3 |
| 4 |
| 15 |
| 4 |
| 15 |
| 4 |
| 15 |
| 4 |
| 15 |
X=15,
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