1) D =29. х1 = -3,1926 х2 = 2,19262) D = 25 x1 = 1 x2 = 3.53) D = 4 и х1 = 3 и х2 = 54) D = 36 и х1 = -4 и х2 = -105) D = 81 и х1 = 1 и х2 = 106) D = 81 и х1=0,2 и х2 = 27) D = 144 и х1 = -0,2 и х2 ~ 0.14285718) D = 5 и х1= 1,618034 и х2 = - 0,618034