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一、口算。
75 + 5 = 43 - 40 = 28 + 9 + 30 =
11 - 2 = 8 + 8 = 64 - 7 + 20 =
60 + 23 = 51 - 6 = 38 + 3 - 8 =
81 - 50 = 4 + 77 = 48 - 9 - 20 =
37 + 6 = 50 - 3 = 60 + 15 - 7 =
21 - 2 = 56 + 9 = 48 + 7 + 40 =
30 + 40 = 27 + 50 = 83 - 6 - 5 =
94 - 7 = 76 - 60 = 67 - 8 + 20 =
68 + 3 = 50 + 19 = 42 + 9 - 40 =
82 - 70 = 73 - 4 = 57 - 40 + 8 =
75 + 5 = 43 - 40 = 28 + 9 + 30 =
11 - 2 = 8 + 8 = 64 - 7 + 20 =
60 + 23 = 51 - 6 = 38 + 3 - 8 =
81 - 50 = 4 + 77 = 48 - 9 - 20 =
37 + 6 = 50 - 3 = 60 + 15 - 7 =
21 - 2 = 56 + 9 = 48 + 7 + 40 =
30 + 40 = 27 + 50 = 83 - 6 - 5 =
94 - 7 = 76 - 60 = 67 - 8 + 20 =
68 + 3 = 50 + 19 = 42 + 9 - 40 =
82 - 70 = 73 - 4 = 57 - 40 + 8 =
答案
一、80 3 67
9 16 77
83 45 33
31 81 19
43 47 68
19 65 95
70 77 72
87 16 79
71 69 11
12 69 25
9 16 77
83 45 33
31 81 19
43 47 68
19 65 95
70 77 72
87 16 79
71 69 11
12 69 25
二、找规律，填数。
答案
二、24 52 39 50
解析
24 52 39 50
