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Bài 20 tiết 3
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87 + 11 = .....
98
Oops!
Okay!
13 + 64 = .....
77
Oops!
Okay!
37 + 13 =.......
50
Oops!
Okay!
35 + 19 =....
54
Oops!
Okay!
27 + 68 = ....
95
Oops!
Okay!
25 + 39 = .....
64
Oops!
Okay!
15 + 38 = .......
53
Oops!
Okay!
13 + 18 = .....
21
Oops!
Okay!
46 + 12 =......
58
Oops!
Okay!
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