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a) S1 = 1 + 2 + 3 +...+ 999 b) S2 = 10 + 12 + 14 + ... + 2010 c) S3 = 21 + 23 + 25 + ... + 1001 d) S5 = 1 + 4 + 7 + ...+79 e) S6 = 15 + 17 + 19 + 21 + ... + 151 + 153 + 155 f) S7 = 15 + 25 + 35 + ...+115 g) S4 = 24 + 25 + 26 + ... + 125 + 126 Trc khi mn lm bài thì mik xin nói là mn hãy lm đúng các bước và ko ghi kết quả ra mà ko có lời giải ạ Bn nào ko lm đc thì đừng có lm nhé
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