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Вопрос по алгебре:
Преобразуйте в многочлен стандартного вида:
а) 3, 1x (0, 4х – 0,5у);
б) (2x +7y) (4х – Зу);
в) (5х + Зу)².
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Автор:
trapper
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а) 3,1x (0,4х – 0,5у) = 1,24x²-1,55xy
б) (2x+7y)(4x-3y) = 8x²-6xy+28xy+21y²
в) Формула сокращенного умножения: (a+b)² = (a²+2ab+b²)
(5x+3y)² = 25x²+30xy+9y².
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