题目内容
| 2 |
| 7 |
| 14 |
| 23 |
| 8 |
| 17 |
考点:乘与除的互逆关系,加法和减法的关系
专题:运算顺序及法则
分析:可以把
×
=2.5×0.4=
+
=9÷9=1
-
=1分解成
×□=1,2.5×□=1,
+□=1,9÷□=1,□-
=1,然后分别解答即可.
| 2 |
| 7 |
| 7 |
| 2 |
| 14 |
| 23 |
| 9 |
| 23 |
| 8 |
| 17 |
| 8 |
| 17 |
| 2 |
| 7 |
| 14 |
| 23 |
| 8 |
| 17 |
解答:
解:
×□=1
□=1÷
□=
2.5×□=1
□=1÷2.5
□=0.4
+□=1
□=1-
□=
9÷□=1
□=1÷9
□=
□-
=1
□=1+
□=1
所以:
×
=2.5×0.4=
+
=9÷9=1
-
=1.
故答案为:
,0.4,
,9,1
.
| 2 |
| 7 |
□=1÷
| 2 |
| 7 |
□=
| 7 |
| 2 |
2.5×□=1
□=1÷2.5
□=0.4
| 14 |
| 23 |
□=1-
| 14 |
| 23 |
□=
| 9 |
| 23 |
9÷□=1
□=1÷9
□=
| 1 |
| 9 |
□-
| 8 |
| 17 |
□=1+
| 8 |
| 17 |
□=1
| 8 |
| 17 |
所以:
| 2 |
| 7 |
| 7 |
| 2 |
| 14 |
| 23 |
| 9 |
| 23 |
| 8 |
| 17 |
| 8 |
| 17 |
故答案为:
| 7 |
| 2 |
| 9 |
| 23 |
| 8 |
| 17 |
点评:应明确每个算式的得数都等于1,根据加法、减法、乘法、除法中各部分之间的关系进行解答.
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