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nganunni
2 năm trước
tính tổng a, S1 = 1+2+3+...+999 b, S2 = 10+12+14+...+2010 c, S3 = 21+23+25+...+1001 d, S4 = 24+25+26+...+125+126 e, S5 = 1+4+7+...+79 f, S7 = 15+17+19+21+...+151+153+155 g, S8 = 15+25+35+...+115
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