4bc≤4b2+c2 довести нерівність
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26.09.2019 20:58
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4вс ≤ 4в² + с²,
4в² - 4вс + с² ≥ 0,
(2в)² - 2*2в*с + с² ≥ 0,
(2в - с)² ≥ 0