User:Bamboo3250: Difference between revisions
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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 {----------------------------------... |
Bamboo3250 (talk | contribs) Removing all content from page |
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