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dmitrij330 36ab- 9a^2-36b^2-36ab=- 9a^2-36b^2=-9*3-36*6=-243

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36ав-(3а+6в)² = 36ав - (9а²+36ав+36в²) = 36ав - 9а² -36ав - 36в² =
= -9а²-36в² при а= √3 при в=√6
-9 (√3)² - 36 (√6)² = -9*3 - 36*6 = -27 - 216 = -243

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