tính nhanh : 3,54 x 73 +2,3 x25 + 3,54 x27 + 1,7 x 25 , b 0,5x 0,125 x 4,8 , c 57 x 5 x 2/3 x 25 x 4/19 , d 6,25 x 7,5 x8,04

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