口算
(1)12÷
1
2
=
(2)1÷1%= (3)9.5+0.5= (4)
1
3
+
1
4
=
(5)0÷
1
5
×2=
(6)1-
11
12
=
(7)
7
8
×
5
14
=
(8)
7
12
÷
7
4
=
(9)
4
5
-
1
2
=
(10)
1
9
×
7
8
×9=
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);
異分母分?jǐn)?shù)相加減,分母不變,分子相加減.
(10)運(yùn)用乘法交換律簡(jiǎn)算.
解答:
解:(1)12÷
1
2
=24,
(2)1÷1%=100, (3)9.5+0.5=10, (4)
1
3
+
1
4
=
7
12
,
(5)0÷
1
5
×2=0,
(6)1-
11
12
=
1
12
(7)
7
8
×
5
14
=
5
16
,
(8)
7
12
÷
7
4
=
1
3
,
(9)
4
5
-
1
2
=
3
10
,
(10)
1
9
×
7
8
×9=
7
8
點(diǎn)評(píng):本題考查了簡(jiǎn)單分?jǐn)?shù)的計(jì)算,注意把結(jié)果化成最簡(jiǎn)分?jǐn)?shù).
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