题目内容
怎样简便就怎样算.
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30×(
|
分析:(1)(2)(3)运用分数的四则混合的运算顺序进行计算即可.
(5)(6)运用乘法的分配律进行计算,使计算会更加简便.
(5)(6)运用乘法的分配律进行计算,使计算会更加简便.
解答:解:(1)
÷
×
,
=
×
×
,
=
;
(2)
÷(
÷
),
=
÷(
×
),
=
÷
÷
,
=
×
×
,
=
;
(3)
÷
×
,
=
×
×
,
=
;
(4)
×32+32×
,
=32×(
+
),
=32×1,
=32;
(5)30×(
-
-
),
=30×
-30×
-30×
,
=24-10-2,
=12.
| 5 |
| 8 |
| 3 |
| 4 |
| 9 |
| 25 |
=
| 5 |
| 8 |
| 4 |
| 3 |
| 9 |
| 25 |
=
| 3 |
| 10 |
(2)
| 1 |
| 56 |
| 3 |
| 14 |
| 6 |
| 13 |
=
| 1 |
| 56 |
| 3 |
| 14 |
| 13 |
| 6 |
=
| 1 |
| 56 |
| 3 |
| 14 |
| 13 |
| 6 |
=
| 1 |
| 56 |
| 14 |
| 3 |
| 6 |
| 13 |
=
| 1 |
| 26 |
(3)
| 16 |
| 27 |
| 8 |
| 3 |
| 3 |
| 8 |
=
| 16 |
| 27 |
| 3 |
| 8 |
| 3 |
| 8 |
=
| 1 |
| 12 |
(4)
| 7 |
| 16 |
| 9 |
| 16 |
=32×(
| 7 |
| 16 |
| 9 |
| 16 |
=32×1,
=32;
(5)30×(
| 4 |
| 5 |
| 1 |
| 3 |
| 1 |
| 15 |
=30×
| 4 |
| 5 |
| 1 |
| 3 |
| 1 |
| 15 |
=24-10-2,
=12.
点评:完成本题要注意分析式中数据,按照正确的运算顺序进行计算,选用合适的简便方法计算.
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