直接寫(xiě)出得數(shù)
5
9
×15=
3
5
×2=
1
4
×
4
5
=
1
9
×
3
7
=
3
20
=
2
5
×
15
4
=
4
17
×34=
8
21
×
7
16
=
3
4
×
1
5
=
5
6
×
2
15
=
6
11
×
1
12
=
3
22
×
11
13
=
分析:(1)(2)(7)題,屬于分?jǐn)?shù)乘整數(shù),把分子與整數(shù)相乘的積做分子,分母不變,能約分的要約分;
(3)(4)(5)(6)(8)(9)(10)(11)(12)題,屬于分?jǐn)?shù)乘分?jǐn)?shù),把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.
解答:解:
5
9
×15=
25
3
;             
3
5
×2=
6
5
;            
1
4
×
4
5
=
1
5
;           
1
9
×
3
7
=
1
21
;
3
20
=
3
20
;               
2
5
×
15
4
=
3
2
;         
4
17
×34=8;           
8
21
×
7
16
=
1
6
;
3
4
×
1
5
=
3
20
;                
5
6
×
2
15
=
1
9
;         
6
11
×
1
12
=
1
22
;        
3
22
×
11
13
=
3
26
;
點(diǎn)評(píng):此題考查了分?jǐn)?shù)的乘法計(jì)算,掌握方法,注意約分.
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