题目内容
72
×2.375+95
×1.6.
| 8 |
| 21 |
| 5 |
| 21 |
分析:72
×2.375+95
×1.6,首先把小数化成分数,72
×2
+95
×1
,再把带分数化成假分数,然后运用乘法分配律、加法交换律、加法结合律进行简算.
| 8 |
| 21 |
| 5 |
| 21 |
| 8 |
| 21 |
| 3 |
| 8 |
| 5 |
| 21 |
| 3 |
| 5 |
解答:解:72
×2.375+95
×1.6,
=72
×2
+95
×1
,
=72
×
+95
×
,
=72×
+
×
+95×
+
×
,
=171+
+152+
,
=(171+152)+(
+
),
=323+
,
=324
.
| 8 |
| 21 |
| 5 |
| 21 |
=72
| 8 |
| 21 |
| 3 |
| 8 |
| 5 |
| 21 |
| 3 |
| 5 |
=72
| 8 |
| 21 |
| 19 |
| 8 |
| 5 |
| 21 |
| 8 |
| 5 |
=72×
| 19 |
| 8 |
| 8 |
| 21 |
| 19 |
| 8 |
| 8 |
| 5 |
| 5 |
| 21 |
| 8 |
| 5 |
=171+
| 19 |
| 21 |
| 8 |
| 21 |
=(171+152)+(
| 19 |
| 21 |
| 8 |
| 21 |
=323+
| 27 |
| 21 |
=324
| 2 |
| 7 |
点评:此题考查的目的是理解掌握乘法分配律、加法交换律、加法结合律的意义,并且能够灵活运用这些运算定律进行简便计算.
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