( 2 + х )² = 4 + 4х + х².
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( 4х - 1 )² = 16х - 8х + 2.
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( 2х + 3у )² = 4х² + 12ху + 9у².
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( х² - 5 )² = х⁴ - 10х² + 25.
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<em><u>Удачи</u></em><em>)</em><em>)</em><em>)</em>