题目内容
已知[(9
-7
)÷2
]÷[(
+□)×1
]=
,那么□=
.
| 1 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 1 |
| 3 |
| 5 |
| 7 |
| 21 |
| 25 |
| 1 |
| 12 |
| 1 |
| 12 |
分析:可以将□看作未知数,根据等式的性质解方程即可求得□的值.
解答:解:[(9
-7
)÷2
]÷[(
+□)×1
]=
,
[1
÷2
]÷[(
+□)×1
]=
,
÷[(
+□)×1
]=
,
(
+□)×1
=
÷
,
(
+□)×1
=
,
+□=
,
□=
.
故答案为:
.
| 1 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 1 |
| 3 |
| 5 |
| 7 |
| 21 |
| 25 |
[1
| 13 |
| 20 |
| 3 |
| 4 |
| 1 |
| 3 |
| 5 |
| 7 |
| 21 |
| 25 |
| 3 |
| 5 |
| 1 |
| 3 |
| 5 |
| 7 |
| 21 |
| 25 |
(
| 1 |
| 3 |
| 5 |
| 7 |
| 3 |
| 5 |
| 21 |
| 25 |
(
| 1 |
| 3 |
| 5 |
| 7 |
| 5 |
| 7 |
| 1 |
| 3 |
| 5 |
| 12 |
□=
| 1 |
| 12 |
故答案为:
| 1 |
| 12 |
点评:本题关键是将□看作未知数,解方程求解.
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