Предмет: Алгебра, автор: нигина44

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ПОМОГИТЕ ПОЖАЛУЙСТА СРОЧНО!!!!

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Автор ответа: Птичка01
1
2) с2 + 81-с2 = 81
4) -16/49 + 16/49 + 4/7d + 4/7d - d2 = 4/7d - d2
6) 5x - k2 + 1.02 + 1.2k + k2 + 1/2k = 1.02 + 2.4k + 5x

P.S. 2 после букв - квадрат буквы.
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