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romaneganov13
@romaneganov13
July 2022
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Решить, (подробностей учитель не дал): 1). -a^2-b^2+2a-b^2. 2). (7x+y)-(-x-2y). 3). (a-b) снизу a^3-b3
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nKrynka
Решение
1) - a² - b² + 2a - b² = -(a² - 2a + 2b²)
2) (7x + y) - (- x - 2y) = 7x + x + y + 2y = 8x + 3y
3) (a - b)/(a³ - b³) = (a - b) /[(a - b)(a² + ab + b²)] = 1/(a² + ab + b²)
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Lubasha2000b
Знаю только второе: (7x+y)-(-x-2y)=7х+у+х+2у=8х+3у
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Answers & Comments
1) - a² - b² + 2a - b² = -(a² - 2a + 2b²)
2) (7x + y) - (- x - 2y) = 7x + x + y + 2y = 8x + 3y
3) (a - b)/(a³ - b³) = (a - b) /[(a - b)(a² + ab + b²)] = 1/(a² + ab + b²)