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Bài 1: Tính một cách hợp lý nhất. a/ 27 +123+ 73 +7 +140 b/ 117+ 83 +553 +47 c/ 7654321- 999998 d/ 7543- 1995 Bài 2: Tính nhanh các phép tính sau a/ 8.36.125 b/ 4.86.25 c) (5252 -312) :52 d) (1800-144) :36 e) 38.25 +75.38 - 280 f) 26.18 - 13.26 giúp mik nhé dg cần gấp
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