Ответы на вопрос:
4x^2 - 5x - 9 = 0 d = 25 -4*4*(-9) = 25 + 144 = 169 v d = 13 x1 = ( 5 + 13 ) : 8 = 2.25 x2 = ( - 8 ) : 8 = ( - 1 ) ======================= 4x^2 = 16x 4 * x * x = 4 * 4 * x x = 4
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