Не вычисляя корней квадратного уравнения, решите уравнение  1) 3X^2-2X-6=0   2) 2/3^2+4X-5/6=0   Решите уравнение (X+1)^2/3-(X-1)/2=(8X-1)/6   Решите уравнение (2X-3)^2-2(5X-4)(X+1)=-9-13X
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