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