14题怎么解
展开全部
D(x1,3/x1) ,E(x2,3/x2)
k1=(3/x1-3/x2)/(x1-x2)=-3/x1x2
因,∠BAC=45
所以,k2=tan∠BAC=1
因,k1*k2=-1
-3/x1x2=-1
x1x2=3
y1y2=3
作DG垂直于AC于点G,则DG=y1=3/y2=3/(3/x2)=x2
AG=OA+OG=(AC-OC)+OG=(2√2-x2)+x1)=2√2+x2-x2
=2√2+(3/x2)-x2
因AG=DG=y1=x2
所以有: 2√2+(3/x2)-x2=x2
2√2+(3/x2)-2x2=0
2(x2)^2-2√2x-3=0
(√2x2-3)(√2x2+1)=0
x2=3√2/2 或x2=-√2/2 (舍去)
x2=3√2/2
y2=3/x2=√2
E(3√2/2,√2)
k1=(3/x1-3/x2)/(x1-x2)=-3/x1x2
因,∠BAC=45
所以,k2=tan∠BAC=1
因,k1*k2=-1
-3/x1x2=-1
x1x2=3
y1y2=3
作DG垂直于AC于点G,则DG=y1=3/y2=3/(3/x2)=x2
AG=OA+OG=(AC-OC)+OG=(2√2-x2)+x1)=2√2+x2-x2
=2√2+(3/x2)-x2
因AG=DG=y1=x2
所以有: 2√2+(3/x2)-x2=x2
2√2+(3/x2)-2x2=0
2(x2)^2-2√2x-3=0
(√2x2-3)(√2x2+1)=0
x2=3√2/2 或x2=-√2/2 (舍去)
x2=3√2/2
y2=3/x2=√2
E(3√2/2,√2)
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询