X1+x2=5/3 U x1*x2=-2/3
x1²+x2²=(x1+x2)²-2x1*x2=(5/3)²-2*(-2/3)=25/9+4/3=25/9+12/9=37/9
Х выносим за скобки
х(х-3)=0
х1=0 х-3=0
х2=3
1)2x²-2x²+5x-4x+2=5 3)x²-7x-11-5x²+13x+18=16-4x²
x+2=5 -4x²+6x+7=16-4x²
x=3 6x=9 x=3/2 x=1.5
2)y³+y+3-6y-4+5y=-2 4)y²-5y⁵-19-5y²+6y⁵+9=22-4y²
y³=-1 y⁵=32
y=-1 y=2
6x-xy-6y+y² =(6x-xy)-(6y-y²)=x(6-y) -y(6-y)=(6-y)(x-y)