直接寫得數(shù)
2
3
=
4
15
×5=
4
5
=
5
7
÷5=
4
5
×
5
8
=
1
4
÷
3
5
=
2
9
÷
2
7
=
7
17
=
1
5
+
2
3
=
7
8
×
3
14
=
9
11
×0=
5
4
×8+8×
1
4
=
分析:分數(shù)乘法:分子相乘的積作為分子,分母相乘的積作為分母;分數(shù)除法根據(jù)除以一個數(shù)乘這個數(shù)的倒數(shù)求解.
解答:解:
2
3
=4,
4
15
×5=
4
3
,
4
5
=10,
5
7
÷5=
1
7
,
4
5
×
5
8
=
1
2
,
1
4
÷
3
5
=
5
12
,
2
9
÷
2
7
=
7
9
7
17
=
17
7
,
1
5
+
2
3
=
13
15
,
7
8
×
3
14
=
3
16
9
11
×0=0,
5
4
×8+8×
1
4
=12.
點評:本題考查了分數(shù)的乘除法,計算時要細心,把結(jié)果化成最簡分數(shù).
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