Toán Lớp 6: Tính Nhanh
G = 20 + 22 + 24 …… + 818
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Toán Lớp 6: Tính Nhanh
G = 20 + 22 + 24 …… + 818
Comments ( 2 )
= 20 + 830+ 830+..
= 20+ [830. (818:2-11)]
= 20+ [830. 398]