题目内容
计算,能简算的要简算.
÷0.6×
÷9+
×
87×
.
| 18 |
| 35 |
| 2 |
| 3 |
| 5 |
| 17 |
| 1 |
| 9 |
| 12 |
| 17 |
87×
| 3 |
| 86 |
考点:运算定律与简便运算
专题:运算定律及简算
分析:(1)把小数换算成分数,先计算除法,再计算乘法;
(2)先把
÷9+
×
写为
×
+
×
;再利用乘法的分配律解答;
(3)先把87×
写为(86+1)×
,再利用乘法的分配律解答.
(2)先把
| 5 |
| 17 |
| 1 |
| 9 |
| 12 |
| 17 |
| 5 |
| 17 |
| 1 |
| 9 |
| 1 |
| 9 |
| 12 |
| 17 |
(3)先把87×
| 3 |
| 86 |
| 3 |
| 86 |
解答:
解:(1)
÷0.6×
=
×
×
=
;
(2)
÷9+
×
=
×
+
×
=
×(
+
)
=
;
(3)87×
=(86+1)×
=3+
=3
.
| 18 |
| 35 |
| 2 |
| 3 |
=
| 18 |
| 35 |
| 5 |
| 3 |
| 2 |
| 3 |
=
| 4 |
| 7 |
(2)
| 5 |
| 17 |
| 1 |
| 9 |
| 12 |
| 17 |
=
| 5 |
| 17 |
| 1 |
| 9 |
| 1 |
| 9 |
| 12 |
| 17 |
=
| 1 |
| 9 |
| 5 |
| 17 |
| 12 |
| 17 |
=
| 1 |
| 9 |
(3)87×
| 3 |
| 86 |
=(86+1)×
| 3 |
| 86 |
=3+
| 3 |
| 86 |
=3
| 3 |
| 86 |
点评:此题考查的目的是理解掌握加法、减法、除法的运算运算性质和乘法的运算定律,并且能够灵活运用这些运算性质和运算定律进行简便计算.
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