5
7
×
3
8
=
15
56
15
56
分析:此題屬于分數(shù)乘法,觀察題干可知,分子分母不能約分,把分子相乘的積做分子,分母相乘的積做分母即可.
解答:解:
5
7
×
3
8
=
15
56
,
故答案為:
15
56
點評:此題重在考查分數(shù)乘法的運算能力.
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計算下面各題.
(1)75+25×12=
(2)64×128÷(32×64)=
(3)72×(
1
3
-
1
2
+
3
4
)=
(4)
1
4
÷(11-
8
13
-
5
13
)=
(5)23×
13
24
+
13
24
=
(6)2.2-8÷11-
2
11
×7=
(7)10
1
2
+(8
1
2
-5
3
7
 )=
(8)8
5
6
-(7
5
6
-3
1
6
)=
(9)(
5
7
+
1
15
)×7+
8
15
=
(10)1
1
5
×85+120%×7+1.2×8=
(11)20÷[
4
7
×(
1
2
-
3
8
)]=
(12)1
17
52
×(5.8-4.4×2)×(0.7-
3
5
)=
(13)(2.5×4.8)×
1
2
÷(2.4×2
1
2
)=
(14)15
3
4
÷1-(5
3
4
÷5.75)×4=
(15)3333×6666+9999×7778= (16)357×256256-356×255255
(17)1
1
2000
+2
2
2000
+3
3
2000
+…1999
1999
2000
=
(18)
5
27
×
3
8
+
7
27
×
5
15
+
5
24
×
4
27
=
(19)
2
3
+
2
9
+
2
27
+
2
81
+
2
243
=
(20)1
1
3
-
7
12
+
9
20
-
11
30
+
13
42
-
15
56
=

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