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tthienhien
2 năm trước
bài 1: tính bằng cách hợp lý ( nếu có thể ) 1) 29 x 42 - 29 x 72 + 30 x ( - 71 ) 2) 1125 - ( 374 + 1125 ) + ( -5 + 374 ) 3) 35 x 38 - 5 x 28 x 7
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