题目内容
解方程
(1)7x+42-3x=156
(2)
-
x=x:
.
(1)7x+42-3x=156
(2)
| 1 |
| 20 |
| 1 |
| 10 |
| 1 |
| 5 |
(1)7x+42-3x=156,
(7-3)x+42=156,
(7-3)x+42-421=156-42,
4x=114,
4x÷4=114÷4,
x=28.5;
(2)
-
x=x:
,
-
x=5x,
-
x+
x=5x+
x,
x=
,
x×
=
×
,
x=
.
(7-3)x+42=156,
(7-3)x+42-421=156-42,
4x=114,
4x÷4=114÷4,
x=28.5;
(2)
| 1 |
| 20 |
| 1 |
| 10 |
| 1 |
| 5 |
| 1 |
| 20 |
| 1 |
| 10 |
| 1 |
| 20 |
| 1 |
| 10 |
| 1 |
| 10 |
| 1 |
| 10 |
| 51 |
| 10 |
| 1 |
| 20 |
| 51 |
| 10 |
| 10 |
| 51 |
| 1 |
| 20 |
| 10 |
| 51 |
x=
| 1 |
| 102 |
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