Editing User:Bamboo3250
Revision as of 17:10, 29 September 2009 by Bamboo3250 (talk | contribs) (New page: Etou... Công thức nghiệm phương trình bậc hai: ax²+bx+c=0 (a≠0) x1=(-b+√Δ)/2a x2=(-b-√Δ)/2a Với: Δ=b²-4ac {----------------------------------...)
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