题目内容
怎样简便就怎么算
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|
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48×(
|
4÷
|
|
分析:(1)
÷
,根据分数除法的计算法则进行计算;
(2)
×
,根据分数乘法的计算法则进行计算;
(3)
×1
,把带分数化成假分数,再根据分数乘法法则计算;
(4)48×(
+
),运用乘法分配律进行简算;
(5)4÷
÷
,根据分数除法的计算法则进行计算;
(6)
×(
-
),根据分数四则混合运算的顺序,按照分数四则运算的计算法则进行计算.
| 4 |
| 5 |
| 2 |
| 3 |
(2)
| 3 |
| 4 |
| 2 |
| 9 |
(3)
| 5 |
| 7 |
| 4 |
| 5 |
(4)48×(
| 1 |
| 8 |
| 1 |
| 6 |
(5)4÷
| 5 |
| 3 |
| 9 |
| 20 |
(6)
| 3 |
| 10 |
| 5 |
| 7 |
| 10 |
| 21 |
解答:解:(1)
÷
,
=
×
,
=1
;
(2)
×
=
;
(3)
×1
,
=
×
,
=1
;
(4)48×(
+
),
=48×
+48×
,
=6+8,
=14;
(5)4÷
÷
,
=4×
×
,
=
×
,
=5
;
(6)
×(
-
),
=
×
,
=
.
| 4 |
| 5 |
| 2 |
| 3 |
=
| 4 |
| 5 |
| 3 |
| 2 |
=1
| 1 |
| 5 |
(2)
| 3 |
| 4 |
| 2 |
| 9 |
| 1 |
| 6 |
(3)
| 5 |
| 7 |
| 4 |
| 5 |
=
| 5 |
| 7 |
| 9 |
| 5 |
=1
| 2 |
| 7 |
(4)48×(
| 1 |
| 8 |
| 1 |
| 6 |
=48×
| 1 |
| 8 |
| 1 |
| 6 |
=6+8,
=14;
(5)4÷
| 5 |
| 3 |
| 9 |
| 20 |
=4×
| 3 |
| 5 |
| 20 |
| 9 |
=
| 12 |
| 5 |
| 20 |
| 9 |
=5
| 1 |
| 3 |
(6)
| 3 |
| 10 |
| 5 |
| 7 |
| 10 |
| 21 |
=
| 3 |
| 10 |
| 5 |
| 21 |
=
| 1 |
| 14 |
点评:此题考查的目的是掌握分数四则混合运算的顺序及分数四则运算的计算法则,并且能够灵活运用简便方法进行计算.
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