口算.
3
4
×
1
2
=
1
2
÷5
=
1
5
-
1
5
=
4
7
×
3
4
=
7
3
÷7
=
3+
1
2
=
4
5
×
1
4
=
5
6
÷
10
13
=
7-
1
3
=
分析:分數(shù)加減法:要先通分成同分母分數(shù),再分母不變,分子相加減;
分數(shù)乘法:分子和分母先交叉約分,再計算;
分數(shù)除法:先改寫成被除數(shù)乘除數(shù)的倒數(shù),再按照分數(shù)乘法的法則進行計算.
解答:
解:
3
4
×
1
2
=
3
8

1
2
÷5
=
1
10

1
5
-
1
5
=0
4
7
×
3
4
=
3
7
7
3
÷7
=
1
3
3+
1
2
=3
1
2
4
5
×
1
4
=
1
5
5
6
÷
10
13
=
13
12
7-
1
3
=6
2
3
點評:此題考查基本的分數(shù)四則運算,根據(jù)運算方法口算即可,要注意把結(jié)果化成最簡分數(shù).
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