题目内容

8
21
×
7
16
=
2
3
÷14=		 26×
12
13
=
14
13
÷28=
12×
4
3
=
9
8
×
8
3
=
5
8
×
1
5
=
2
3
×24=
9
5
÷
3
10
=		 25÷4+25×
3
4
=
分析：分数乘法：分子相乘的积做分子，分母相乘的积做分母，能约分的先约分；
分数除法：除以一个不为零的数等于乘上这个数的倒数；
25÷4+25×
3
4
先把除法变成乘法，再运用乘法分配律简算．
解答：解：
8
21
×
7
16
=
1
6
2
3
÷14=
1
21
 26×
12
13
=24
14
13
÷28=
1
26
12×
4
3
=16
9
8
×
8
3
=3
5
8
×
1
5
=
1
8
2
3
×24=16
9
5
÷
3
10
=6		 25÷4+25×
3
4
=25．
点评：本题考查了简单的运算，要注意根据运算法则和运算定律快速准确的得出答案．
练习册系列答案
相关题目
1÷
1
5
=
16
9
×
27
4
=		 12+2.28=
3
4
×
3
4
=
9
22
÷
18
11
=
8
21
×
7
16
=
7
10
+
3
10
=		 100-46= 0.12=
5
7
×0=
13÷65=
1
2
-
1
3
=		 1.2÷0.6= 5÷10= 4×25= 1.6+8=
3
4
+
1
8
=		 21÷9=
3
7
×
14
15
=		 0.25+0.16= 1÷
9
10
=
计算下面各题．
20×
2
5
=
1
3
÷
3
8
=
8
21
×
7
16
=
1
6
+
2
5
=
3
4
÷6=
3
4
×12=
2
13
÷8=		 2-
7
9
=
口算：
5
9
×15=
3
5
×2=
1
4
×
4
5
=
1
9
×
3
7
=
7
12
×
3
4
=		 1×
3
20
=
2
5
×
15
4
=
4
17
×34=
8
21
×
7
16
=
1
20
×
2
3
=
5
6
×
2
15
=
15
17
×
17
15
=
直接写出得数
5
9
×15=
3
5
×2=
1
4
×
4
5
=
1
9
×
3
7
=
1×
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
=
直接写得数
5
9
×15=
3
5
×2=
1
4
×
4
5
=
1
9
×
3
7
=
7
12
×
3
4
=
1×
3
20
=
2
5
×
15
4
=
4
17
×34=
8
21
×
7
16
=
1
20
×
2
3
=
3
4
×
1
5
=
5
6
×
2
15
=
5
6
÷10=
6
13
÷
5
26
=		 0÷
5
8
=
8
9
÷4=		 1÷
2
3
=		 22÷
11
12
=
9
53
÷
9
53
=
2
5
÷0.4=

违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com

精英家教网