直接寫(xiě)數(shù):
3
14
=
3
7
÷6
=
2
3
÷
3
2
=
1
2
÷
2
3
=
5
6
÷5
=
5
6
÷6
=
12
5
÷
6
5
=
5
7
÷
10
21
=
3
7
÷
9
14
=
1
3
=
分析:利用分?jǐn)?shù)乘法:分子相乘的積做分子,分母相乘的積做分母;分?jǐn)?shù)除法:除以一個(gè)不為零的數(shù)等于乘上這個(gè)數(shù)的倒數(shù)直接計(jì)算即可.
解答:
解:
3
14
=
3
2
,
3
7
÷6
=
1
14
,
2
3
÷
3
2
=
4
9
1
2
÷
2
3
=
3
4
,
5
6
÷5
=
1
6
5
6
÷6
=
5
36
,
12
5
÷
6
5
=2,
5
7
÷
10
21
=
3
2
3
7
÷
9
14
=
2
3
,
1
3
=3.
點(diǎn)評(píng):本題考查了簡(jiǎn)單的分?jǐn)?shù)乘除法,計(jì)算時(shí)要細(xì)心,把結(jié)果化成最簡(jiǎn)分?jǐn)?shù).
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