Ответы на вопрос:
(14х - 1) ( 2 +х) = (2х-8) (7х+1) 28х + 14х² - 2 - х = 14х² + 2х - 56х - 8 27х + 14х² - 2 = 14х² - 54х - 8 27х +14х² - 14х² + 54х = - 8+2 81х = -6 х= - 6 : 81 = - 6/81 х= - 2/27 проверим: (14 * (-2/27) - 1 ) ( 2 + (-2/27)) = ( 2 * (-2/27) - 8)( 7 * (-2/27) + 1 ) (- 28/27 - 1) * 1 25/27 = (-4/27 - 8) ( - 14/27 + 1) -55/27 * 52/27 = -220/27 * 13/27 - 2860/729 = - 2860/729 - 3 673/729 = - 3 673/729
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