乘法简便计算20.docx
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乘法简便计算20.docx
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乘法简便计算20
4
×
61
×
25
8
×
25
125
×
16
×
8
52
×
48
+
52
×
52
25
×
30
×
4
24
×
(60
+
3)
8
×
38
×
125
44
×
99
38
×
29
+
38
16
×
125
81
×
51
-
81
42
×
101
4
×
50
×
25
24
×
25
125
×
59
×
8
44
×
76
+
44
×
24
25
×
91
×
4
26
×
(30
+
1)
8
×
80
×
125
83
×
101
80
×
69
+
80
24
×
125
67
×
61
-
67
76
×
101
4
×
57
×
25
36
×
25
125
×
49
×
8
53
×
61
+
53
×
39
25
×
78
×
4
29
×
(30
+
2)
8
×
73
×
125
48
×
101
71
×
79
+
71
32
×
125
42
×
21
-
42
93
×
99
4
×
10
×
25
8
×
25
125
×
38
×
8
13
×
41
+
13
×
59
25
×
54
×
4
21
×
(70
+
1)
8
×
26
×
125
15
×
101
49
×
59
+
49
64
×
125
74
×
11
-
74
20
×
99
4
×
26
×
25
40
×
25
125
×
39
×
8
48
×
71
+
48
×
29
25
×
12
×
4
23
×
(10
+
2)
8
×
55
×
125
22
×
99
17
×
89
+
17
32
×
125
88
×
51
-
88
26
×
101
4
×
85
×
25
16
×
25
125
×
78
×
8
50
×
71
+
50
×
29
25
×
97
×
4
26
×
(10
+
7)
8
×
79
×
125
69
×
99
86
×
29
+
86
32
×
125
59
×
51
-
59
65
×
99
4
×
85
×
25
28
×
25
125
×
12
×
8
68
×
89
+
68
×
11
25
×
30
×
4
26
×
(80
+
9)
8
×
47
×
125
32
×
99
30
×
99
+
30
80
×
125
70
×
31
-
70
95
×
99
4
×
5
×
25
36
×
25
125
×
6
×
8
51
×
20
+
51
×
80
25
×
60
×
4
25
×
(60
+
3)
8
×
80
×
125
70
×
99
15
×
69
+
15
40
×
125
80
×
51
-
80
18
×
101
4
×
93
×
25
32
×
25
125
×
41
×
8
62
×
16
+
62
×
84
25
×
27
×
4
27
×
(60
+
9)
8
×
65
×
125
50
×
101
13
×
39
+
13
64
×
125
56
×
21
-
56
86
×
101
4
×
13
×
25
40
×
25
125
×
30
×
8
16
×
30
+
16
×
70
25
×
15
×
4
24
×
(10
+
3)
8
×
89
×
125
20
×
99
58
×
39
+
58
24
×
125
61
×
61
-
61
95
×
101
4
×
29
×
25
20
×
25
125
×
84
×
8
82
×
60
+
82
×
40
25
×
39
×
4
23
×
(10
+
6)
8
×
20
×
125
26
×
99
90
×
29
+
90
80
×
125
31
×
11
-
31
44
×
101
4
×
9
×
25
28
×
25
125
×
80
×
8
9
×
51
+
9
×
49
25
×
67
×
4
29
×
(80
+
6)
8
×
64
×
125
29
×
101
20
×
39
+
20
8
×
125
38
×
61
-
38
58
×
99
4
×
58
×
25
4
×
25
125
×
50
×
8
38
×
58
+
38
×
42
25
×
91
×
4
25
×
(30
+
1)
8
×
42
×
125
34
×
101
14
×
99
+
14
8
×
125
23
×
41
-
23
99
×
101
4
×
77
×
25
40
×
25
125
×
4
×
8
48
×
19
+
48
×
81
25
×
75
×
4
23
×
(50
+
8)
8
×
34
×
125
31
×
99
21
×
89
+
21
40
×
125
24
×
91
-
24
92
×
99
4
×
35
×
25
8
×
25
125
×
26
×
8
39
×
46
+
39
×
54
25
×
79
×
4
25
×
(90
+
9)
8
×
5
×
125
86
×
99
32
×
19
+
32
40
×
125
57
×
21
-
57
21
×
101
4
×
28
×
25
20
×
25
125
×
17
×
8
56
×
49
+
56
×
51
25
×
45
×
4
29
×
(30
+
5)
8
×
50
×
125
23
×
99
97
×
39
+
97
80
×
125
71
×
11
-
71
74
×
99
4
×
36
×
25
4
×
25
125
×
24
×
8
93
×
99
+
93
×
1
25
×
83
×
4
25
×
(90
+
6)
8
×
54
×
125
95
×
99
34
×
99
+
34
80
×
125
15
×
41
-
15
67
×
99
4
×
94
×
25
12
×
25
125
×
36
×
8
7
×
95
+
7
×
5
25
×
19
×
4
26
×
(60
+
5)
8
×
40
×
125
14
×
99
58
×
19
+
58
8
×
125
45
×
11
-
45
78
×
101
4
×
95
×
25
20
×
25
125
×
9
×
8
91
×
33
+
91
×
67
25
×
22
×
4
26
×
(70
+
1)
8
×
15
×
125
92
×
99
19
×
19
+
19
80
×
125
71
×
61
-
71
81
×
101
4
×
91
×
25
36
×
25
125
×
73
×
8
65
×
12
+
65
×
88
25
×
63
×
4
26
×
(40
+
8)
8
×
98
×
125
60
×
101
52
×
29
+
52
32
×
125
21
×
81
-
21
33
×
99
4
×
14
×
25
8
×
25
125
×
20
×
8
9
×
73
+
9
×
27
25
×
19
×
4
21
×
(40
+
4)
8
×
53
×
125
54
×
101
62
×
29
+
62
16
×
125
58
×
31
-
58
82
×
99
4
×
92
×
25
40
×
25
125
×
63
×
8
38
×
57
+
38
×
43
25
×
28
×
4
27
×
(10
+
8)
8
×
91
×
125
47
×
99
70
×
89
+
70
24
×
125
47
×
21
-
47
81
×
101
4
×
99
×
25
36
×
25
125
×
70
×
8
40
×
31
+
40
×
69
25
×
38
×
4
25
×
(10
+
6)
8
×
33
×
125
45
×
101
92
×
89
+
92
32
×
125
72
×
51
-
72
69
×
101
4
×
66
×
25
12
×
25
125
×
47
×
8
92
×
52
+
92
×
48
25
×
87
×
4
29
×
(20
+
1)
8
×
36
×
125
73
×
99
16
×
89
+
16
16
×
125
43
×
11
-
43
53
×
99
4
×
37
×
25
32
×
25
125
×
19
×
8
62
×
66
+
62
×
34
25
×
51
×
4
28
×
(20
+
8)
8
×
39
×
125
75
×
101
11
×
69
+
11
72
×
125
84
×
51
-
84
16
×
101
4
×
33
×
25
40
×
25
125
×
72
×
8
74
×
30
+
74
×
70
25
×
4
×
4
24
×
(50
+
8)
8
×
9
×
125
30
×
101
33
×
19
+
33
48
×
125
31
×
81
-
31
42
×
99
4
×
53
×
25
24
×
25
125
×
62
×
8
11
×
94
+
11
×
6
25
×
83
×
4
24
×
(80
+
4)
8
×
31
×
125
34
×
101
66
×
49
+
66
64
×
125
22
×
31
-
22
44
×
101
4
×
25
×
25
16
×
25
125
×
96
×
8
54
×
60
+
54
×
40
25
×
4
×
4
29
×
(90
+
9)
8
×
92
×
125
87
×
101
38
×
99
+
38
72
×
125
18
×
31
-
18
94
×
99
4
×
19
×
25
36
×
25
125
×
85
×
8
81
×
29
+
81
×
71
25
×
22
×
4
28
×
(30
+
5)
8
×
93
×
125
85
×
101
79
×
39
+
79
64
×
125
36
×
41
-
36
58
×
99
4
×
31
×
25
16
×
25
125
×
8
×
8
60
×
75
+
60
×
25
25
×
56
×
4
25
×
(10
+
8)
8
×
99
×
125
21
×
99
87
×
49
+
87
48
×
125
60
×
61
-
60
36
×
99
4
×
52
×
25
20
×
25
125
×
42
×
8
56
×
78
+
56
×
22
25
×
94
×
4
27
×
(60
+
6)
8
×
49
×
125
66
×
99
13
×
19
+
13
56
×
125
20
×
91
-
20
21
×
101
4
×
5
×
25
24
×
25
125
×
38
×
8
17
×
78
+
17
×
22
25
×
95
×
4
21
×
(10
+
8)
8
×
82
×
125
16
×
101
21
×
89
+
21
32
×
125
93
×
11
-
93
50
×
101
4
×
12
×
25
12
×
25
125
×
88
×
8
15
×
70
+
15
×
30
25
×
20
×
4
29
×
(10
+
5)
8
×
22
×
125
37
×
99
21
×
29
+
21
40
×
125
58
×
71
-
58
74
×
101
4
×
25
×
25
40
×
25
125
×
84
×
8
30
×
91
+
30
×
9
25
×
73
×
4
25
×
(90
+
7)
8
×
73
×
125
87
×
99
87
×
19
+
87
40
×
125
36
×
11
-
36
18
×
99
4
×
97
×
25
8
×
25
125
×
26
×
8
83
×
57
+
83
×
43
25
×
87
×
4
28
×
(40
+
6)
8
×
13
×
125
15
×
101
49
×
49
+
49
16
×
125
43
×
81
-
43
77
×
99
4
×
62
×
25
16
×
25
125
×
89
×
8
14
×
37
+
14
×
63
25
×
74
×
4
28
×
(80
+
1)
8
×
74
×
125
88
×
101
85
×
49
+
85
24
×
125
88
×
71
-
88
82
×
99
4
×
97
×
25
36
×
25
125
×
83
×
8
34
×
59
+
34
×
41
25
×
74
×
4
22
×
(80
+
6)
8
×
82
×
125
91
×
101
62
×
39
+
62
8
×
125
94
×
21
-
94
72
×
99
4
×
2
×
25
28
×
25
125
×
4
×
8
21
×
68
+
21
×
32
25
×
32
×
4
24
×
(40
+
5)
8
×
31
×
125
85
×
101
88
×
79
+
88
8
×
125
53
×
71
-
53
38
×
101
4
×
42
×
25
40
×
25
125
×
71
×
8
2
×
65
+
2
×
35
25
×
63
×
4
26
×
(30
+
3)
8
×
26
×
125
52
×
99
54
×
29
+
54
48
×
125
54
×
81
-
54
33
×
101
4
×
6
×
25
20
×
25
125
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