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