решите 3 квадратных уравнения
6x^2+7x-3=0
20x^2+26x-6=0
3x^2-19x-14=0

6x^2+7x-3=0Д=49+72=121√Д=11х1=(-7+11)/12=1/3х2=(-7-11)/12=-1.5___________________20x^2+26x-6=0Д=676+480=1156√Д=34х1=(-26+34)/40=8/40=0,2х2=(-26-34)/40=-1.5____________________3x^2-19x-14=0Д=361+168=529√Д=23х1=(19+23)/6=7х2=(19-23)/6=2/3