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Must Waste More Time...
(4x^2-y^2)+(2x-y)
первую скобку разложим на множители по формуле разность квадратов а вторую оставим без изменений
(2x-y)(2x+y)+(2x-y)
у нас получилось две одинаковые скобочки мы эти скобочки вынесем за скобку и получим
(2x-y)(2x+y+1)- это и есть ответ
б) сгруппируем первое со вторым третье с четвертым
(x^2-9y^2)+(x-3y)
первую скобку разложим на множители по формуле разность квадратов а вторую оставим без изменений
(x-3y)(x+3y)+(x-3y)
у нас получилось две одинаковые скобочки мы эти скобочки вынесем за скобку и получим
(x-3y)(x+3y+1)- это и есть ответ