6х-3х^2=0
3х^2-12х=0
7y^2+y=0
4y-y^2=0
х^4-17х^2+16=0
х^4+5^2-36=0
х^4-8^2+16=0
х^4+5x^2+9=0

1)x(6-3x)=0[x=0      [x=0[-3x=-6  [x=22)x(3x-12)=0[x = 0      [x=0[3x = 12  [x=43)y(7y+1)=0[y=0      [y = 0[7y = -1 [y = -(1/7)4)y(4-y)=0[y = 0[y = 4