题目内容
求未知数X
X÷
|
0.75X-
|
分析:(1)先计算
÷
=
,然后等式的两边再同时乘
即可;
(2)等式的两边同时加上
,然后等式的两边同时除以0.75即可.
| 26 |
| 45 |
| 13 |
| 25 |
| 10 |
| 9 |
| 6 |
| 35 |
(2)等式的两边同时加上
| 1 |
| 4 |
解答:解:
(1)X÷
=
÷
,
X÷
=
,
X÷
×
=
×
,
X=
;
(2)0.75X-
=
,
0.75X-
+
=
+
,
0.75X=
,
0.75X÷0.75=
÷0.75,
X=1.
(1)X÷
| 6 |
| 35 |
| 26 |
| 45 |
| 13 |
| 25 |
X÷
| 6 |
| 35 |
| 10 |
| 9 |
X÷
| 6 |
| 35 |
| 6 |
| 35 |
| 10 |
| 9 |
| 6 |
| 35 |
X=
| 4 |
| 21 |
(2)0.75X-
| 1 |
| 4 |
| 1 |
| 2 |
0.75X-
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
0.75X=
| 3 |
| 4 |
0.75X÷0.75=
| 3 |
| 4 |
X=1.
点评:本题主要考查解方程,根据等式的性质进行解答即可.
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