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aleksa553

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(x+12)(x-4)(x-20) більше
Answer
Довести 1) 16x² - 8xy +3y² ≥0; 2) m²n² + m² + 4n² +9 ≥10mn 3) 9c² + d² + 4 ≥ 3cd-6c-2d
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