Mathematics, 20.06.2021 03:40, adiaripley6408

Cho a+b+c=0. chứng minh 2bc+b^2+c^2-a^2=4p(p-a)

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Cho a+b+c=0. chứng minh 2bc+b^2+c^2-a^2=4p(p-a)...