N
nguyenhoaithu_99


[Toán 8] Tính nhanh 
a) (2^2+4^2+6^2+...+100^2)-(1^2+3^2+5^2+...+99^2)
b) 2004^3+1/2004^2-2003
c) 2005^3-1/2005^2+2006
a) (2^2+4^2+6^2+...+100^2)-(1^2+3^2+5^2+...+99^2)
b) 2004^3+1/2004^2-2003
c) 2005^3-1/2005^2+2006
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