直接寫出得數(shù)
3
4
+
1
2
=

1
3
-
1
4
=

12×
3
4
=

2
7
×14=

20÷
4
9
=
2
3
×
7
8
=
2
13
=
2
5
÷
3
2
=
1
2
÷
2
3
×12=
14×
5
7
÷14×
5
7
=
分析:分出加減法:先通分變成同分母的分?jǐn)?shù)再計(jì)算;
分?jǐn)?shù)乘法:分子與分子相乘的積做分子,分母與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);由此求解.
解答:解:
3
4
+
1
2
=1
1
5
,

1
3
-
1
4
=
1
12
,

12×
3
4
=9,

2
7
×14=4,

20÷
4
9
=45,
2
3
×
7
8
=
7
12
,
2
13
=0,
2
5
÷
3
2
=
4
15
,
1
2
÷
2
3
×12=9,
14×
5
7
÷14×
5
7
=
25
49
點(diǎn)評(píng):本題考查了分?jǐn)?shù)的計(jì)算,運(yùn)用運(yùn)算法則求解,注意把結(jié)果化成最簡分?jǐn)?shù).
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