题目内容
(2009?旅顺口区)直接写得数
(
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分析:(1)、(2)运用分数的乘法分配律进行计算即可.
(3)、(4)、(5)按照分数的四则混合运用的顺序进行计算即可.
(3)、(4)、(5)按照分数的四则混合运用的顺序进行计算即可.
解答:解:(1)(
+
)×30,
=30×
+30×
,
=18+5,
=23;
(2)
×
+
×
,
=
×(
+
),
=
×
,
=
;
(3)
+
×
,
=
+
,
=
,;
(4)
÷
-
÷5,
=
×6-
×
,
=5-
,
=4
;
(5)
×
÷
,
=
×
,
=0.5;
| 3 |
| 5 |
| 1 |
| 6 |
=30×
| 3 |
| 5 |
| 1 |
| 6 |
=18+5,
=23;
(2)
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 6 |
| 13 |
=
| 1 |
| 7 |
| 8 |
| 13 |
| 6 |
| 13 |
=
| 1 |
| 7 |
| 14 |
| 13 |
=
| 2 |
| 13 |
(3)
| 7 |
| 10 |
| 3 |
| 10 |
| 1 |
| 6 |
=
| 14 |
| 20 |
| 1 |
| 20 |
=
| 3 |
| 4 |
(4)
| 5 |
| 6 |
| 1 |
| 6 |
| 5 |
| 6 |
=
| 5 |
| 6 |
| 5 |
| 6 |
| 1 |
| 5 |
=5-
| 1 |
| 6 |
=4
| 5 |
| 6 |
(5)
| 5 |
| 9 |
| 3 |
| 4 |
| 5 |
| 6 |
=
| 5 |
| 12 |
| 6 |
| 5 |
=0.5;
点评:本题运用分数的加减,乘除法的计算法则进行计算即可.
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