直接寫出復數(shù).
3
5
×
1
2
=
2
3
=
4
5
÷8=
2
7
=
3
8
×12=
1
5
×
16
25
=
1
4
-
1
5
=
1
3
+
1
4
=
9
10
÷
3
20
=
14÷
7
8
=
分析:分數(shù)加減法,先通分成同分母分數(shù),再分母不變,分子相加減;
分數(shù)除法,利用分數(shù)除法的計算方法,即除以一個數(shù)等于乘這個數(shù)的倒數(shù);
分數(shù)乘法,分子和分母能約分的,要先約分,再計算;據(jù)此解答.
解答:
解:
3
5
×
1
2
=
3
10
,
2
3
=
3
2
,
4
5
÷8=
1
10
,
2
7
=2,
3
8
×12=
9
2
,
1
5
×
16
25
=
16
125
1
4
-
1
5
=
1
20
,
1
3
+
1
4
=
7
12
9
10
÷
3
20
=6,
14÷
7
8
=16.
點評:此題考查了分數(shù)的四則運算,是基礎題型,比較簡單,按照運算法則計算即可..
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