题目内容

直接写出复数.
2
5
×20
=
16×
3
8
=
3
4
×
2
3
=
8
19
×0
=
5
6
÷10
=
1
5
=
5
7
÷
5
7
=
3
4
×
3
4
=
2
3
+
1
6
=
3
7
+
1
3
=
3
5
-
1
6
=
3
5
-
1
2
=
分析:
8
19
×0
根据任何数乘0都得0计算;分数除法的题目,根据除以一个数等于乘这个数的倒数来计算;异分母分数相加减先通分,然后再相加减.
解答:解:
2
5
×20
=8,
16×
3
8
=6,
3
4
×
2
3
=
1
2
8
19
×0
=0,
5
6
÷10
=
1
12
1
5
=20,
5
7
÷
5
7
=1,
3
4
×
3
4
=
9
16
2
3
+
1
6
=
5
6
3
7
+
1
3
=
16
21
3
5
-
1
6
=
13
30
3
5
-
1
2
=
1
10
故答案为:8,6,
1
2
,0,
1
12
,20,1,
9
16
5
6
16
21
13
30
1
10
点评:本题考查了基本的计算,计算时要细心,注意把结果化成最简分数.
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