Toán Lớp 8: tính nhanh. d. D=200^2-199.201
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Toán Lớp 8: tính nhanh. d. D=200^2-199.201
Comments ( 2 )
$D=(199+1).200-199.(200+1)$
$D=199.200-200-199.200+199$
$D=(200-199)+(199.200-199.200)$
$D=1$
@Nobitao@