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