Bài 1: TÝnh nhanh ( nếu có thể) a) -37 + 54 + (-70) + (-163) + 256 b) – 359 + 181 + (-123) + 350 + (-172) c) – 69 + 53 + 46 + (-94) + (-14) +78 d) -2003 + (-21+75 + 2003) e) 1125 – ( 374 + 1125) + (-65 +374) f) 31. (-18) + 31. ( - 81) – 31

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