题目内容
解方程
(1)
X-4=28 (2)5-
X=3 (3)x×5=100×
.
(1)
| 8 |
| 5 |
| 5 |
| 8 |
| 3 |
| 4 |
(1)
x-4=28,
x-4+4=28+4,
x×
=32×
,
x=20;
(2)5-
x=3,
5-
x+
x=3+
x,
3+
x-3=5-3,
x×
=2×
,
x=3
;
(3)x×5=100×
,
5x=75,
5x÷5=75÷5,
x=15.
| 8 |
| 5 |
| 8 |
| 5 |
| 8 |
| 5 |
| 5 |
| 8 |
| 5 |
| 8 |
x=20;
(2)5-
| 5 |
| 8 |
5-
| 5 |
| 8 |
| 5 |
| 8 |
| 5 |
| 8 |
3+
| 5 |
| 8 |
| 5 |
| 8 |
| 8 |
| 5 |
| 8 |
| 5 |
x=3
| 1 |
| 5 |
(3)x×5=100×
| 3 |
| 4 |
5x=75,
5x÷5=75÷5,
x=15.
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