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goryunovamarta
@goryunovamarta
June 2023
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Розкладіть на множники:
а) c² – b² + c – b;
б) х + у + х² – у²;
в) а² + 4,8ab – x² – 4,8xb.
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Answers & Comments
MrChingiz911
а) c^2 - b^2 = (c+b)(c-b) => c^2 - b^2 + c - b = (c-b)(c+b) + c-b = (c-b)(c+b+1)
б) x+y + x^2 - y^2 = x + y + (x-y)(x+y) = (x-y+1)(x+y)
в) a^2 + 4,8ab - x^2 - 4,8xb = a^2 + 2*a*(2,4b) + (2,4b)^2 - (2,4)b^2 - x^2 - 2*x*(2,4b) = (a + 2,4b)^2 - (x + 2,4b)^2 = (a + x + 4,8b)(a - x)
7 votes
Thanks 8
nm1965295
ааааа вотето пацан реально реально выручил
Lev44ik
Щикарно
Lev44ik
в скобочках нет, но спасибо за ответ )))
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Answers & Comments
б) x+y + x^2 - y^2 = x + y + (x-y)(x+y) = (x-y+1)(x+y)
в) a^2 + 4,8ab - x^2 - 4,8xb = a^2 + 2*a*(2,4b) + (2,4b)^2 - (2,4)b^2 - x^2 - 2*x*(2,4b) = (a + 2,4b)^2 - (x + 2,4b)^2 = (a + x + 4,8b)(a - x)