3
4
×
2
3
×
2
5
=
1
5
1
5
;
4
21
×
7
21
=
4
63
4
63
7
9
×
3
5
×
5
21
=
1
9
1
9
;
35
48
×
8
15
×
6
7
=
1
3
1
3
;
108×
7
18
=
42
42
64
95
×
19
32
=
2
5
2
5
;
9
14
×
35
36
=
5
8
5
8
5
24
×120=
25
25
11
15
×
25
33
=
5
9
5
9
;
17
36
×
72
85
=
2
5
2
5
;
4
15
+
5
12
=
41
60
41
60
29
42
×
56
87
=
4
9
4
9
;
4
2
5
×
10
11
=
4
4
;
2
4
5
×
15
28
=
3
2
3
2
3
5
7
×
8
13
×1
2
7
=
144
49
144
49
3
4
5
×4×
7
18
=
266
45
266
45
;
2
5
8
×3
3
7
×
1
9
=
1
1
19
20
×
4
9
×
25
38
=
5
18
5
18
;
2
5
6
×12=
34
34
;
3
3
7
×14=
48
48
;
5
1
5
×4=
104
5
104
5
7
3
8
×2=
59
4
59
4
;
3
1
2
×4=
14
14
7×3
2
15
=
329
15
329
15
;
7
12
×12
5
6
=
539
72
539
72
;
2
3
×6
4
5
=
68
15
68
15
7
25
-
1
5
)×50=
4
4
;
1
3
+
3
4
)×12=
13
13
;
1
3
÷
1
12
=
4
7
÷12=
1
21
1
21
;
8
9
÷
3
7
=
56
27
56
27
3
4
=
4
3
4
3
;
10
11
=
11
2
11
2
;
14
11
÷21=
2
33
2
33
;
5
8
÷
5
6
=
3
4
3
4
;
9
10
÷
3
5
=
3
2
3
2
;
8
9
÷
8
3
=
1
3
1
3
;
3
10
÷
10
3
=
9
100
9
100
;
1
5
×
5
8
=
1
8
1
8
3
5
÷5=
3
25
3
25
分析:
7
25
-
1
5
)×50,(
1
3
+
3
4
)×12,可以運(yùn)用乘法分配律簡(jiǎn)算;三個(gè)數(shù)相乘的可以直接約分,然后再相乘;帶分?jǐn)?shù)先化成假分?jǐn)?shù)再相乘;其它題目按照運(yùn)算法則直接求解.
解答:
解:
3
4
×
2
3
×
2
5
=
1
5
;
4
21
×
7
21
=
4
63
;
7
9
×
3
5
×
5
21
=
1
9
35
48
×
8
15
×
6
7
=
1
3
;
108×
7
18
=42;
64
95
×
19
32
=
2
5
;
9
14
×
35
36
=
5
8
;
5
24
×120=25;
11
15
×
25
33
=
5
9
;
17
36
×
72
85
=
2
5
4
15
+
5
12
=
41
60
;
29
42
×
56
87
=
4
9
4
2
5
×
10
11
=4;
2
4
5
×
15
28
=
3
2
;
3
5
7
×
8
13
×1
2
7
=
144
49
3
4
5
×4×
7
18
=
266
45
;
2
5
8
×3
3
7
×
1
9
=1;
19
20
×
4
9
×
25
38
=
5
18
;
2
5
6
×12=34;
3
3
7
×14=48;
5
1
5
×4=
104
5
;
7
3
8
×2=
59
4
3
1
2
×4=14;
7×3
2
15
=
329
15
7
12
×12
5
6
=
539
72
;
2
3
×6
4
5
=
68
15
;
7
25
-
1
5
)×50=4;
1
3
+
3
4
)×12=13;
1
3
÷
1
12
=4;
4
7
÷12=
1
21
;
8
9
÷
3
7
=
56
27
3
4
=
4
3
;
10
11
=
11
2
;
14
11
÷21=
2
33
;
5
8
÷
5
6
=
3
4
;
9
10
÷
3
5
=
3
2
;
8
9
÷
8
3
=
1
3
;
3
10
÷
10
3
=
9
100
;
1
5
×
5
8
=
1
8
3
5
÷5=
3
25
點(diǎn)評(píng):本題主要考查了基本的分?jǐn)?shù)乘除法的計(jì)算,計(jì)算時(shí)要細(xì)心,把結(jié)果化成最簡(jiǎn)分?jǐn)?shù).
練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目:小學(xué)數(shù)學(xué) 來源: 題型:

直接寫出得數(shù).
382-297=
1
5
+
1
3
=
1
2
÷2=
3.8+6.2= 8.1÷3×2=
5
11
×33=
68-198= 0.65÷1.3= 75×10%= 0.75-(0.75+3.4)=
3
8
=
1÷0.01=
3
4
-
2
3
=
2
5
+
3
5
×2=
48×(
1
4
-
1
6
)=

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來源: 題型:

(2004?北塘區(qū))
25×4= 0.4×0.2= 8-0.8= 0.24÷0.6=
2
3
×
2
5
=
1
2
-
1
3
=
3
4
=
2
3
-
1
4
=
1.75-(0.75+
2
5
)
=
560÷16÷5=

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來源: 題型:

計(jì)算,能簡(jiǎn)算的一定要簡(jiǎn)算.
65.5+65.5×99
5
8
×[1÷(
3
4
+
1
3
)]

2
5
÷
3
4
÷
1
15

2.25×1.8+12.5×0.18
2
3
×
2
3
÷2.

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來源: 題型:

(2012?浙江)
直接寫出得數(shù).
3.14×8=
7
8
×
16
35
=
2
5
÷
1
2
=
3
8
一0.375)×5=
2
3
-
1
4
=
786-298=
3
4
+
1
5
=
25×1.7×4=

查看答案和解析>>

同步練習(xí)冊(cè)答案