题目内容
| 4 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 7 |
| 3 |
| 7 |
| 7 |
| 3 |
2
2
×| 1 |
| 2 |
| 1 |
| 2 |
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 1 |
| 3 |
分析:根据倒数的意义:乘积是1的两个数互为倒数,分数的倒数,分子和分子交换位置;根据加减法之间的关系求出后面的两个空.
解答:解:
的倒数是
,
的倒数是
,
2×
=1,
1-
=
,
1+
=
;
×
=
×
=2×
=
+
=
-
=1.
故答案为:
,
,2
,
,
.
| 4 |
| 3 |
| 3 |
| 4 |
| 7 |
| 3 |
| 3 |
| 7 |
2×
| 1 |
| 2 |
1-
| 1 |
| 3 |
| 2 |
| 3 |
1+
| 1 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 3 |
| 4 |
| 3 |
| 7 |
| 7 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 3 |
| 4 |
| 3 |
| 1 |
| 3 |
故答案为:
| 3 |
| 4 |
| 3 |
| 7 |
| 1 |
| 2 |
| 2 |
| 3 |
| 4 |
| 3 |
点评:本题主要考查了倒数的意义和加减法之间的关系.
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