设A(x1,0),B(x2,0),C(0,y)
则 x1=±2,x2=±1,y=±1.
y=y*(x-x1)(x-x2)/(x1*x2)
将x1,x2,y的值代入上式,可得八个函数.
1) y=(x-1)(x-2)/2
2) y=-(x-1)(x-2)/2
3) y=(x-1)(x+2)/2
4) y=-(x-1)(x+2)/2
5) y=(x+1)(x-2)/2
6) y=-(x+1)(x-2)/2
7) y=(x+1)(x+2)/2
8) y=-(x+1)(x+2)/2
设A(x1,0),B(x2,0),C(0,y)
则 x1=±2,x2=±1,y=±1.
y=y*(x-x1)(x-x2)/(x1*x2)
将x1,x2,y的值代入上式,可得八个函数.
1) y=(x-1)(x-2)/2
2) y=-(x-1)(x-2)/2
3) y=(x-1)(x+2)/2
4) y=-(x-1)(x+2)/2
5) y=(x+1)(x-2)/2
6) y=-(x+1)(x-2)/2
7) y=(x+1)(x+2)/2
8) y=-(x+1)(x+2)/2