题目内容
|
|
分析:(1)运用加法交换律简算;
(2)运用加法结合律简算.
(2)运用加法结合律简算.
解答:解:(1)
+
+
,
=(
+
)+
,
=1+
,
=1
;
(2)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2.
| 4 |
| 9 |
| 1 |
| 10 |
| 5 |
| 9 |
=(
| 4 |
| 9 |
| 5 |
| 9 |
| 1 |
| 10 |
=1+
| 1 |
| 10 |
=1
| 1 |
| 10 |
(2)
| 1 |
| 12 |
| 3 |
| 8 |
| 11 |
| 12 |
| 5 |
| 8 |
=(
| 1 |
| 12 |
| 11 |
| 12 |
| 3 |
| 8 |
| 5 |
| 8 |
=1+1,
=2.
点评:这两题是基本的简算题,直接运用加法的运算定律便可解决.
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