三年级奥数乘法简便运算及答案
绝世美人儿
841次浏览
2021年01月19日 02:47
最佳经验
本文由作者推荐
劳动最光荣儿歌-信用社述职报告
2018
秋季数学集训三队
A
教材每周习题
(6)
参考答案
星期一
简便计算。
125
×
4×
8
×
25
×
5
×
2 1200
÷
25 600000
÷
125
÷
8
÷
25
÷
4
=
(125
×
8)
×
(4
×
25)
×
(5
×
2)
=
(1200
×
4)
÷
(25
×
4)
=
600000
÷
(125
×
8)
÷
(2 5
×
4)
=
1000
×
100
×
10
=
4800
÷
100
=
600000
÷
1000
÷
100
=
1000000
=
48
=
6
或:原式=
12
×
(100
÷
25)
=
12
×
4
8
÷
7
+
9
÷
7
+
1 1
÷
7 125
=
(8
+
9
+
11)
÷
7
=
28
÷
7
=
4
372
÷
162
×
54 2222
=
372
÷
(162
÷
54)
=
372
÷
3
=
124
简便计算。
222
×
444
+
222
×
556 1440
=
222
×
(444
+
556)
=
222
×
1000
=
222000
28
÷
3
×
54
×
15÷
54
÷
14 ( 48
=
(28
÷
14)
×
(54
÷
54)
×
(15
÷
3)
=
2
×
1
×
5
=
10
(720
-
180
-
450)
÷
9 72
=
720
÷
9
-
180
÷
9
-
450
÷
9
=
80
-
20
-
50
=
10
=
48
×
401 21
×
73
+
26
×
21
+
21
=
125
×
(400
+
1)
=
21
×
(73
+
26
+
1)
=
125
×
400
+
125
=
21
×
100
=
50000
+
125
=
2100
=
50125
×
9998 981
+
5
×
9810
+
49
×
981
=
2222
×
(10000
-
2) =
981
+
50
×
981
+
49
×< br>981
=
2222
×
10000
-
2222
×
2
=
981
×
(1
+
50
+
49)
=
22220000
-
4444
=
981
×
100
=
22215556
=
98100
星期二
×
976
÷
488
=
1440
×
(976
÷
488)
=
1440
×
2
=
2880
×
75< br>×
81)
÷
(25
×
24
×
27)
=
(48
÷
24)
×
(75
÷
25)
×
(81
÷
27)
=
2
×
3
×
3
=
18
×
108
+
108
×
46
-
118
×
142
+
118
×
134
=
108
×
(72
+
46)
-
118
×< br>(142
-
134)
=
108
×
118
-
118
×
8
=
118
×
(108
-
8)
=
11800
1