(1)若x-y-z=3,yz-xy-xz=3,则x^2+y^2+z^2=多少?(2)x^2+x+1/x^2+1/x-4=(1/x+x+?)(1/x+x-?)(3)因式分解:4m^3+m-1(4)已知x^2-x-1=0,求x^5-x^4-3x^3+3x^2+x的值(5)a^2-9x^2+6xy-y^2/(a+3x)^2-(ay+3xy)=1,求证y=6x.

　　(1)若x-y-z=3,yz-xy-xz=3,则x^2+y^2+z^2=多少?

　　(2)x^2+x+1/x^2+1/x-4=(1/x+x+?)(1/x+x-?)

　　(3)因式分解:4m^3+m-1

　　(4)已知x^2-x-1=0,求x^5-x^4-3x^3+3x^2+x的值

　　(5)a^2-9x^2+6xy-y^2/(a+3x)^2-(ay+3xy)=1,求证y=6x.