题目内容
(2008?兴山县)解方程
20-4x=5
:
=
:x
×
+75%x=
.
20-4x=5
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分析:由等式的性质以及比例的性质为依据解方程即可.
解答:解:20-4x=5
4x=20-5,
4x=15
x=3.75;
:
=
:x
x=
×
,
x=
×
÷
,
x=
×
×
,
x=
;
×
+75%x=
.
+
x=
,
x=
-
,
x=
,
x=
÷
,
x=
×
x=
.
4x=20-5,
4x=15
x=3.75;
| 3 |
| 5 |
| 7 |
| 12 |
| 9 |
| 10 |
| 3 |
| 5 |
| 7 |
| 12 |
| 9 |
| 10 |
x=
| 7 |
| 12 |
| 9 |
| 10 |
| 3 |
| 5 |
x=
| 7 |
| 12 |
| 9 |
| 10 |
| 5 |
| 3 |
x=
| 7 |
| 8 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
| 3 |
| 4 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 6 |
| 3 |
| 4 |
| 1 |
| 12 |
x=
| 1 |
| 12 |
| 3 |
| 4 |
x=
| 1 |
| 12 |
| 4 |
| 3 |
x=
| 1 |
| 9 |
点评:此题主要考查解方程的方法.
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