1)д=25-4*2*2=9
х1=2 х2=0,5
2)(х-1)(х-2)-3(х-3)-(х-з)(х-2)=0
x^2-3x+2-3x+9-x^2-5x-5=0
-11x+6=0
11x=6
x=6/11
3)2x(x^2-4)=0
2x=0
x1=0
x^2=4
x2=2
x3=-2
4)x^2(x^2-10)=-9
x1=3 x2=-3
x3=1 x4=-1
5)4(x-3)=x^2-12x+36
4x-12-x^2+12x-36
-x^2+16x-48=0
д=256-192=64
х1=4 х2=12