直接寫得數(shù)
1
4
÷
2
3
=
3
4
×
4
7
=
1
3
-
1
4
=
1
8
=
5
12
×
5
6
=
32÷
4
5
=
5-
1
2
=
5
14
×35=
分析:分數(shù)乘整數(shù),用分數(shù)的分子和整數(shù)相乘的積做分子,分母不變;分數(shù)乘分數(shù),用分子相乘的積做分子,分母相乘的積做分母,能約分的要約分;分數(shù)除以一個數(shù),等于乘這個數(shù)的倒數(shù);異分母分數(shù)相加減,先依據(jù)分數(shù)的基本性質(zhì)化成同分母分數(shù),再進行加減.
解答:解:

1
4
÷
2
3
=
3
8
3
4
×
4
7
=
3
7
1
3
-
1
4
=
1
12
1
8
=48
5
12
×
5
6
=
25
72
32÷
4
5
=40
5-
1
2
=
9
2
5
14
×35=
25
2
點評:此題主要考查分數(shù)四則運算的計算法則的靈活應(yīng)用.
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