а) у²-6у-7=0
D=36+4*1*(-7)=64
y1=6+8/2=7
y2=6-8/2=-1
в) 2y²-y-6=0
D=1-4*2(-6)=49
y1=1+7/4=2
y2=1-7/4=-1.5
а) у²-6у-7=0
D=36+4*1*(-7)=64
y1=6+8/2=7
y2=6-8/2=-1
в) 2y²-y-6=0
D=1-4*2(-6)=49
y1=1+7/4=2
y2=1-7/4=-1.5