Images C2 4BC 4B2

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C2 4bc 4b2. А^2 + BC + c2. A2+b2+c2-2ab-2bc+2ac. Докажите неравенство a2+b2. 3ab(a+b)-a^3-b^3.
А^2 + BC + c2. A2+b2+c2-2ab-2bc+2ac. Докажите неравенство a2+b2. 3ab(a+b)-a^3-b^3.

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