1/9у²-2ху+9х² = (1/3y - 3x)² = (27/3 - 3*11)² = (9-33)² = (-24)² = 576
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1/9у²-2ху+9х² = (1/3y - 3x)² = (27/3 - 3*11)² = (9-33)² = (-24)² = 576