题目内容
(
+
)×27 87×
×16×
.
| 8 |
| 9 |
| 4 |
| 27 |
| 3 |
| 86 |
| 5 |
| 7 |
| 21 |
| 5 |
分析:(1)根据乘法分配律进行计算;
(2)把87变为(86+1),再根据乘法分配律进行计算;
(3)根据乘法交换律计算.
(2)把87变为(86+1),再根据乘法分配律进行计算;
(3)根据乘法交换律计算.
解答:解:(1)(
+
)×27,
=
×27+
×27,
=24+4,
=28;
(2)87×
,
=(86+1)×
,
=86×
+
,
=3+
,
=3
;
(3)
×16×
,
=
×
×16,
=3×16,
=48.
| 8 |
| 9 |
| 4 |
| 27 |
=
| 8 |
| 9 |
| 4 |
| 27 |
=24+4,
=28;
(2)87×
| 3 |
| 86 |
=(86+1)×
| 3 |
| 86 |
=86×
| 3 |
| 86 |
| 3 |
| 86 |
=3+
| 3 |
| 86 |
=3
| 3 |
| 86 |
(3)
| 5 |
| 7 |
| 21 |
| 5 |
=
| 5 |
| 7 |
| 21 |
| 5 |
=3×16,
=48.
点评:本题主要考查了学生对乘法运算定律的运用情况.注意要细心.
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