题目内容
(2006?京口区)简便计算.
(1)78+34+22+366
(2)
×
-
×
.
(1)78+34+22+366
(2)
| 17 |
| 16 |
| 3 |
| 8 |
| 3 |
| 8 |
| 1 |
| 16 |
分析:(1)运用加法交换律和结合律;(2)运用分数的乘法分配律.
解答:解:(1)78+34+22+366,
=(78+22)+(34+366),
=100+400,
=500;
(2)
×
-
×
,
=
×(
-
),
=
×1,
=
.
=(78+22)+(34+366),
=100+400,
=500;
(2)
| 17 |
| 16 |
| 3 |
| 8 |
| 3 |
| 8 |
| 1 |
| 16 |
=
| 3 |
| 8 |
| 17 |
| 16 |
| 1 |
| 16 |
=
| 3 |
| 8 |
=
| 3 |
| 8 |
点评:此题考查了整数的四则混合运算、运算定律与简便运算和分数的四则混合运算.
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