Ответы на вопрос:
0,6x^2 + 0,8x - 7,8 = 0 6x^2 + 8x - 78 = 0 2 * ( 3x^2 + 4x - 39 ) = 0 d = 16 + 468 = 484 ; √ d = 22 x1 = ( - 4 + 22 ) : 6 = 3 x2 = ( - 4 - 22 ) : 6 = - 4 ( 1/3 )
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