题目内容
用简便方法计算:
×(63+
)
×
+
×
87×
.
| 5 |
| 9 |
| 27 |
| 20 |
| 4 |
| 17 |
| 5 |
| 9 |
| 13 |
| 9 |
| 5 |
| 17 |
87×
| 7 |
| 86 |
考点:分数的简便计算
专题:运算定律及简算
分析:(1)(2)运用乘法分配律简算;
(3)把87看作86+1,运用乘法分配律简算.
(3)把87看作86+1,运用乘法分配律简算.
解答:
解:(1)
×(63+
)
=
×63+
×
=35+
=35
(2)
×
+
×
=
×(
+
)
=
×
=
(3)87×
=(86+1)×
=86×
+
=7+
=7
| 5 |
| 9 |
| 27 |
| 20 |
=
| 5 |
| 9 |
| 5 |
| 9 |
| 27 |
| 20 |
=35+
| 3 |
| 4 |
=35
| 3 |
| 4 |
(2)
| 4 |
| 17 |
| 5 |
| 9 |
| 13 |
| 9 |
| 5 |
| 17 |
=
| 5 |
| 17 |
| 4 |
| 9 |
| 13 |
| 9 |
=
| 5 |
| 17 |
| 17 |
| 9 |
=
| 5 |
| 9 |
(3)87×
| 7 |
| 86 |
=(86+1)×
| 7 |
| 86 |
=86×
| 7 |
| 86 |
| 7 |
| 86 |
=7+
| 7 |
| 86 |
=7
| 7 |
| 86 |
点评:此题主要考查了乘法分配律的灵活运用情况.
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