x²+x-1=0 3x²-6x-1=0
x^2+x=1 x^2-2x=1/3
(X+1/2)^2=5/4 (X-1)^2=4/3
x=+或-√（5/4）-1/2 x=+或-√（4/3）+1
2x²-5x-4=0 2x²-3x-1=0
(x-5/4)^2=57/16 (x-3/4)^2=25/16
x=+或-√（57/16）+5/4 x=2或x=-1/2
3x²-9x+2=0
x^2-3x=2/3
(x-3/2)^2=35/12
x=+或-√35/12+3/2
02月11日 编辑 fanwen51.com
x²+x-1=0 3x²-6x-1=0
x^2+x=1 x^2-2x=1/3
(X+1/2)^2=5/4 (X-1)^2=4/3
x=+或-√（5/4）-1/2 x=+或-√（4/3）+1
2x²-5x-4=0 2x²-3x-1=0
(x-5/4)^2=57/16 (x-3/4)^2=25/16
x=+或-√（57/16）+5/4 x=2或x=-1/2
3x²-9x+2=0
x^2-3x=2/3
(x-3/2)^2=35/12
x=+或-√35/12+3/2
