题目内容
计算能力展示.
×16
(
+
)×24
87×
×
×
.
| 13 |
| 24 |
(
| 1 |
| 8 |
| 7 |
| 12 |
87×
| 3 |
| 86 |
| 4 |
| 9 |
| 3 |
| 4 |
| 9 |
| 11 |
分析:(1)直接约分进行计算;
(2)根据乘法分配律进行计算;
(3)根据乘法分配律进行计算;
(4)根据乘法交换律进行计算.
(2)根据乘法分配律进行计算;
(3)根据乘法分配律进行计算;
(4)根据乘法交换律进行计算.
解答:解:(1)
×16=
;
(2)(
+
)×24,
=
×24+
×24,
=3+14,
=17;
(3)87×
,
=(86+1)×
,
=86×
+1×
,
=3+
,
=3
;
(4)
×
×
,
=
×
×
,
=
×
,
=
.
| 13 |
| 24 |
| 26 |
| 3 |
(2)(
| 1 |
| 8 |
| 7 |
| 12 |
=
| 1 |
| 8 |
| 7 |
| 12 |
=3+14,
=17;
(3)87×
| 3 |
| 86 |
=(86+1)×
| 3 |
| 86 |
=86×
| 3 |
| 86 |
| 3 |
| 86 |
=3+
| 3 |
| 86 |
=3
| 3 |
| 86 |
(4)
| 4 |
| 9 |
| 3 |
| 4 |
| 9 |
| 11 |
=
| 4 |
| 9 |
| 9 |
| 11 |
| 3 |
| 4 |
=
| 4 |
| 11 |
| 3 |
| 4 |
=
| 3 |
| 11 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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