3 квадратных уравнения
1) 2x^2-25x-13=0
2) 2x^2-29x+99=0
3) 4x^2+11x-45=0

1) D=625-4×2×(-13)=625+104=729=27X1=25-27/4=-2/4=-1/22)D=841-4×2×99=841-792=49=7x1=29-7/4=22/4=5,5x2=29+7/4=36/4=93) D=121-4×4×(-45)=121+720=841=29x1=-11+29/8=18/8=9/4x2=-11-29/8=-40/8=5