口算
56×
7
8
=
2-
6
7
=
1
2
+
1
8
=
17
3
=
0.25×4= 57×
3
19
=
8
9
÷
2
3
=
10
11
=
21÷
3
7
=
3
5
÷
2
5
=
2
3
=
2
3
=
分析: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)數(shù)等于乘這個(gè)數(shù)的倒數(shù).
解答:解:
56×
7
8
=49,
2-
6
7
=1
1
7
1
2
+
1
8
=
5
8
17
3
=34,
0.25×4=1, 57×
3
19
=9,
8
9
÷
2
3
=
4
3
,
10
11
=
11
10
,
21÷
3
7
=49,
3
5
÷
2
5
=
3
2
2
3
=
3
2
,
2
3
=0.
點(diǎn)評:本題主要考查了分?jǐn)?shù)乘除法的計(jì)算方法,計(jì)算時(shí)要細(xì)心,把結(jié)果化成最簡分?jǐn)?shù).
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