直接寫(xiě)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?jǐn)?shù)乘法:分子相乘的積作為分子,分母相乘的積作為分母;分?jǐn)?shù)除法根據(jù)除以一個(gè)數(shù)乘這個(gè)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(diǎn)評(píng):本題考查了分?jǐn)?shù)的乘除法,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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