1)2(х-1)=3(2х-1); 2)3(1-x)=4x-11; 3)3-5(x-1)=x-2; 4)3(x-2)-2(x-1)=17. как решить?
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Ответы на вопрос:
1) 2x - 2 = 6x - 3 6x - 2x = - 2 + 3 4x = 1 x = 0,25 2) 3 - 3x = 4x - 11 4x + 3x = 3 + 11 7x = 14 x = 2 3) 3 - 5x + 5 = x - 2 x + 5x = 8 + 2 6x = 10 x = 10/6 = 5/3 = 1 2/3 4) 3x - 6 - 2x + 2 = 17 x = 17 + 4 x = 21
4x² + 5x - 6 = 0 d = b² - 4ac = 5² - 4 × 4 × (-6) = 25 + 96 = 121 = 11² x1 = (-5 + 11) / 8 = 6/8 = 0,75 x2 = ( - 5 - 11) / 8 = - 16 / 8 = - 2 3x² - x - 2 = 0 d = b² - 4ac = (-1)² - 4 × 3 × (-2) = 1 + 24 = 25 = 5² x1 = ( 1 + 5 ) / 6 = 1 x2 = ( 1 - 5 ) / 6 = - 4 / 6 = - 2/3
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