Г)x^3-11x^2+28x=0 Д)x^3+7x^2=18x Е)5x^4-6x^3+x^2=0

x(x^2-11x+28) = 0 X=0      x^2-11x+28 =0            D = 121 - 112 = 9= 3^2            X1 = 7 X2=4 x^3+7x^2-18x = 0 x(x^2 +7x - 18) = 0 x=0    x^2+7x-18 = 0          D = 49 +72 = 121 = 11^2          x1 = 2 X2 = -9 5x^4-6x^3+x^2=0 X^2(5x^2 - 6x + 1) =0 x^2 =0      5x^2 - 6x +1 =0 x = 0        D = 36 -20 = 16 = 4^2                x1 = 1    x2=0.2