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20070903aA
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Bài 1 : Tính tống các số hạng có quy luật sau : C = 1 + 2 + 3 + …+ n ( voi n la so nhien ) D = 2 + 4 + 6 + 8 + … + 98 + 100 E = 1 + 4 + 7 + 10 + … + 301 + 304 F = 2 + 5 + 8 + 11 + 14 + … + 293 + 296 G = 5 + 10 + 15 + … + 205 + 210 + 215 Giải giúp mik với mọi người
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