题目内容
| 巧解密码我能行. (1)
|
(2)
|
分析:(1)等式的两边同时减去
,然后等式的两边再同时除以
即可;
(2)先计算
x-
x=
x,然后等式的两边同时除以
即可.
| 2 |
| 3 |
| 1 |
| 5 |
(2)先计算
| 1 |
| 4 |
| 1 |
| 7 |
| 3 |
| 28 |
| 3 |
| 28 |
解答:解:(1)
+
x=
,
+
x-
=
-
,
x=
,
x÷
=
÷
,
x=
;
(2)
x-
x=
,
x=
,
x÷
=
÷
,
x=
.
| 2 |
| 3 |
| 1 |
| 5 |
| 7 |
| 8 |
| 2 |
| 3 |
| 1 |
| 5 |
| 2 |
| 3 |
| 7 |
| 8 |
| 2 |
| 3 |
| 1 |
| 5 |
| 5 |
| 24 |
| 1 |
| 5 |
| 1 |
| 5 |
| 5 |
| 24 |
| 1 |
| 5 |
x=
| 25 |
| 24 |
(2)
| 1 |
| 4 |
| 1 |
| 7 |
| 3 |
| 5 |
| 3 |
| 28 |
| 3 |
| 5 |
| 3 |
| 28 |
| 3 |
| 28 |
| 3 |
| 5 |
| 3 |
| 28 |
x=
| 28 |
| 5 |
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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