d) 13 – 18 – (- 42) – 15 b) 250 . 50 . 4 . 2 e) (18+ 21)- (- 41 +18 +21) c) 2245 + (-176) + (-2245) + (-24) + 347 f) 25.90 + 18.25 – 200 Bài 5. Tìm số nguyên n, sao cho: a) n – 6 chia hết cho n – 1 b) 3n + 2 chia hết cho n + 1

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