题目内容
简算的要简算.
①1-
-
②
+
-
.
①1-
| 3 |
| 11 |
| 7 |
| 11 |
②
| 4 |
| 9 |
| 5 |
| 6 |
| 4 |
| 9 |
分析:①根据连续减去两个数,等于减去这两个数的和简算;
②运用加法交换律简算.
②运用加法交换律简算.
解答:解:①1-
-
,
=1-(
-
),
=1-
,
=
;
②
+
-
,
=
-
+
,
=0+
,
=
.
| 3 |
| 11 |
| 7 |
| 11 |
=1-(
| 3 |
| 11 |
| 7 |
| 11 |
=1-
| 10 |
| 11 |
=
| 1 |
| 11 |
②
| 4 |
| 9 |
| 5 |
| 6 |
| 4 |
| 9 |
=
| 4 |
| 9 |
| 4 |
| 9 |
| 5 |
| 6 |
=0+
| 5 |
| 6 |
=
| 5 |
| 6 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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