直接寫出得數(shù).
4
15
÷
2
5
=
3
7
=
5
6
=
9
20
÷
7
10
=
4
5
+
13
20
=
3
2
×
4
9
=
1
10
÷10
=
7
12
÷14
=
4
15
÷12
=
3
101
×0
=
14
15
÷
7
30
=
36÷
27
25
=
分析:(1)(2)(3)(4)(7)(8)(9)(11)(12)屬于分?jǐn)?shù)的除法,把除法變?yōu)槌朔,能約分的要約分;(5)屬于分?jǐn)?shù)加法,先通分,再計(jì)算;(6)屬于分?jǐn)?shù)乘法,約分計(jì)算;(10)0乘任何數(shù)都得0.
解答:解:

4
15
÷
2
5
=
2
3
3
7
=
7
3
5
6
=
12
5
9
20
÷
7
10
=
9
14
4
5
+
13
20
=
29
20
3
2
×
4
9
=
2
3
1
10
÷10
=
1
100
7
12
÷14
=
1
24
4
15
÷12
=
1
45
3
101
×0
=0
14
15
÷
7
30
=4
36÷
27
25
=
100
3
點(diǎn)評(píng):此題考查了分?jǐn)?shù)的乘除法計(jì)算,注意乘除法的轉(zhuǎn)化和約分計(jì)算,以及“0乘任何數(shù)都得0”這一知識(shí)點(diǎn).
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