题目内容
(
+
+
+
+
+
)×385计算结果的整数部分是
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 11 |
| 1 |
| 13 |
517
517
.分析:通过观察,可把原式拆为(
+
+
)×385+(
+
+
)×385,运用乘法分配律简算,进一步解决问题.
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 11 |
| 1 |
| 13 |
解答:解:(
+
+
+
+
+
)×385,
=(
+
+
)×385+(
+
+
)×385,
=
+
+
+77+55+35,
=516+
+
+
,
=517+
,
所以整数部分是517.
故答案为:517.
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 11 |
| 1 |
| 13 |
=(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 11 |
| 1 |
| 13 |
=
| 192 |
| 2 |
| 128 |
| 3 |
| 29×8 |
| 13 |
=516+
| 1 |
| 2 |
| 1 |
| 3 |
| 8 |
| 13 |
=517+
| 35 |
| 78 |
所以整数部分是517.
故答案为:517.
点评:完成此题,注意根据数字特点,运用运算定律,灵活简算.
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