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