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dongabanlang
2 năm trước
bài 1 tính a)25/38+7/38-10/38=. b)15/9×4/32 bài 2 thực hiện phép tính a)3/4+4/5-2/10 b)1/14+3/16+5/14+5/16 c)8/19×12/13+8/19×14/13 d)14/11×(6/4-2/5):5/2
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