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October 2021
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Раскройте скобки а)(2x-3y)(5x+7y-1) б)(a-b)(a^2+ab+b^2)
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Mar51
А) (2х - 3у)(5х + 7у - 1) = 2х · 5х - 3у ·5х + 2х ·7у - 3у ·7у - 2х ·1 + 3у ·1 = 10х² - - 15ху + 14ху - 21у² - 2х + 3у = 10х² - ху - 21у² -2х + 3у
б) (а -b)(a² + ab + b²) = a³ - b³ - решаем по формуле разности кубов
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Answers & Comments
б) (а -b)(a² + ab + b²) = a³ - b³ - решаем по формуле разности кубов