Ответы на вопрос:
21t² - (7t - 3) × ( 3t + 1 ) = -2 21t² - ( 21t² + 7t - 9t - 3 ) = -2 21t² - 21t² - 7t + 9t + 3 = -2 21t² - 21t² - 7t + 9t = -2 - 3 2t = -5 t = (-5) ÷ 2 t = -2,5. ответ : t = -2,5.
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