题目内容

3
4
×16=
4
13
×
3
8
=
1
7
-
1
8
=
2
9
×
1
6
=
1
4
=
4
9
÷
2
3
=
2
15
÷4=
5
7
÷
7
5
=
1
5
+
1
4
=
1
2
-
1
3
=
100×
8
15
=
1
4
=
2
3
=
14
15
-
4
5
=
12÷
5
8
=
1
15
=
分析:(1)(2)(4)(11)(12)约分计算;(5)(6)(7)(8)(13)(15)把除法变为乘法,再计算;(3)(9)(10)(14)通分计算;(16)0乘任何数都得0.
解答:解:
3
4
×16=12;           
4
13
×
3
8
=
3
26
;             
1
7
-
1
8
=
1
56
;              
2
9
×
1
6
=
1
27

1
4
=24;                 
4
9
÷
2
3
=
2
3
;              
2
15
÷4=
1
30
;             
5
7
÷
7
5
=
25
49

1
5
+
1
4
=
9
20
;                
1
2
-
1
3
=
1
6
;                100×
8
15
=
160
3
;          8×
1
4
=2;
2
3
=
3
2
;                 
14
15
-
4
5
=
2
15
;             12÷
5
8
=
96
5
;              0×
1
15
=0.
故答案为:12,
3
26
1
56
1
27
,24,
2
3
1
30
25
49
9
20
1
6
160
3
,2,
3
2
2
15
96
5
,0.
点评:此题属于分数的四则运算,考查了约分、通分、乘除法的转化以及“0乘任何数都得0”等知识.
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