乘法简便计算18.docx
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乘法简便计算18.docx
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乘法简便计算18
4
×
25
×
25
28
×
25
125
×
62
×
8
66
×
92
+
66
×
8
25
×
19
×
4
25
×
(30
+
6)
8
×
70
×
125
65
×
99
29
×
79
+
29
72
×
125
60
×
41
-
60
75
×
99
4
×
56
×
25
36
×
25
125
×
9
×
8
54
×
60
+
54
×
40
25
×
3
×
4
29
×
(90
+
5)
8
×
91
×
125
74
×
101
24
×
49
+
24
64
×
125
57
×
61
-
57
38
×
101
4
×
45
×
25
8
×
25
125
×
27
×
8
9
×
39
+
9
×
61
25
×
76
×
4
21
×
(10
+
2)
8
×
35
×
125
13
×
101
54
×
19
+
54
8
×
125
21
×
61
-
21
69
×
99
4
×
93
×
25
20
×
25
125
×
27
×
8
17
×
52
+
17
×
48
25
×
71
×
4
26
×
(60
+
1)
8
×
11
×
125
53
×
101
55
×
89
+
55
32
×
125
96
×
21
-
96
89
×
101
4
×
47
×
25
12
×
25
125
×
59
×
8
94
×
89
+
94
×
11
25
×
54
×
4
25
×
(40
+
8)
8
×
66
×
125
17
×
101
18
×
19
+
18
24
×
125
94
×
71
-
94
52
×
101
4
×
70
×
25
36
×
25
125
×
36
×
8
70
×
98
+
70
×
2
25
×
48
×
4
27
×
(20
+
3)
8
×
60
×
125
57
×
99
27
×
89
+
27
72
×
125
94
×
21
-
94
71
×
101
4
×
66
×
25
40
×
25
125
×
80
×
8
20
×
78
+
20
×
22
25
×
57
×
4
27
×
(60
+
3)
8
×
71
×
125
68
×
99
34
×
89
+
34
48
×
125
50
×
41
-
50
75
×
101
4
×
42
×
25
36
×
25
125
×
40
×
8
75
×
19
+
75
×
81
25
×
97
×
4
29
×
(30
+
6)
8
×
23
×
125
55
×
99
75
×
89
+
75
8
×
125
60
×
51
-
60
68
×
99
4
×
28
×
25
20
×
25
125
×
36
×
8
18
×
75
+
18
×
25
25
×
99
×
4
22
×
(40
+
1)
8
×
3
×
125
39
×
101
52
×
89
+
52
16
×
125
87
×
31
-
87
68
×
101
4
×
27
×
25
36
×
25
125
×
69
×
8
55
×
28
+
55
×
72
25
×
7
×
4
27
×
(60
+
5)
8
×
41
×
125
68
×
99
27
×
49
+
27
48
×
125
68
×
21
-
68
62
×
101
4
×
89
×
25
36
×
25
125
×
73
×
8
35
×
98
+
35
×
2
25
×
25
×
4
26
×
(40
+
7)
8
×
42
×
125
57
×
101
19
×
49
+
19
56
×
125
21
×
21
-
21
40
×
101
4
×
11
×
25
8
×
25
125
×
74
×
8
31
×
68
+
31
×
32
25
×
98
×
4
28
×
(70
+
4)
8
×
78
×
125
96
×
101
62
×
29
+
62
64
×
125
46
×
41
-
46
19
×
99
4
×
13
×
25
24
×
25
125
×
35
×
8
38
×
71
+
38
×
29
25
×
92
×
4
26
×
(90
+
6)
8
×
44
×
125
29
×
101
23
×
69
+
23
24
×
125
95
×
31
-
95
80
×
99
4
×
6
×
25
4
×
25
125
×
23
×
8
87
×
76
+
87
×
24
25
×
6
×
4
25
×
(90
+
1)
8
×
75
×
125
17
×
101
53
×
49
+
53
32
×
125
67
×
81
-
67
35
×
99
4
×
14
×
25
4
×
25
125
×
72
×
8
44
×
56
+
44
×
44
25
×
11
×
4
22
×
(60
+
6)
8
×
92
×
125
80
×
99
48
×
79
+
48
32
×
125
41
×
11
-
41
78
×
101
4
×
76
×
25
36
×
25
125
×
92
×
8
62
×
99
+
62
×
1
25
×
44
×
4
27
×
(50
+
1)
8
×
12
×
125
54
×
101
73
×
99
+
73
16
×
125
92
×
61
-
92
85
×
101
4
×
57
×
25
16
×
25
125
×
59
×
8
49
×
60
+
49
×
40
25
×
79
×
4
23
×
(30
+
6)
8
×
2
×
125
25
×
101
24
×
39
+
24
72
×
125
77
×
11
-
77
76
×
101
4
×
63
×
25
32
×
25
125
×
74
×
8
32
×
61
+
32
×
39
25
×
73
×
4
23
×
(10
+
5)
8
×
58
×
125
58
×
101
75
×
29
+
75
48
×
125
32
×
31
-
32
40
×
99
4
×
58
×
25
4
×
25
125
×
21
×
8
88
×
35
+
88
×
65
25
×
45
×
4
24
×
(10
+
5)
8
×
5
×
125
96
×
99
60
×
49
+
60
80
×
125
53
×
21
-
53
26
×
101
4
×
40
×
25
20
×
25
125
×
64
×
8
63
×
34
+
63
×
66
25
×
38
×
4
24
×
(50
+
4)
8
×
34
×
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