狠狠色综合图片区
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  ʱ䣺2022-08-11 04:57:54
(1)   4/a2-1/(a2-1)=1   4a2-4-a2=a^4-a2   a^4-4a2+4=0   a2=2   x2/2-y2=1   ֱPQ   ˫  2λ  1λ  Ϊ  y=kx+b (x+22/2-(y+12=1    x2-2y2+4x-4y=0  (y-kx/b=1    x2-2y2+(4xy-4kx2)/b-(4y2-4kxy)/b=0   y/x=t   1-2t2+(4t-4k)/b-(4t2-4kt)/b=0   1-2t2+4t/b-4k/b-4t2/b+4kt/b=0   (-2-4/bt2+(4k+4)t/b+(b-4k)/b=0   (-2b-4t2+(4k+4)t+(b-4k)=0   kAP+kAQ=0   t1+t2=0   (2k+2)/(b+2)=0   k=-1 (2)   P'(x1y1)  Q'(x2y2)  x1x2  ֱAPбǦ  cot=m   2m/(1-m2)=22   m=2/2   kA'P'=2   y/x=t   x2-2y2+4x-4y=0  (y+x/b=1   (-2b-4t2+(b+4)=0   t1t2=-2   -(b+4)/(2b+4)=-2   b=-4/3   y=-x-4/3  x2-2y2+4x-4y=0   x2-2(x2+8/3x+16/9)+4x+4x+16/3=0   -x2-16/3x-32/9+8x+16/3=0   -9x2-48x-32+72x+48=0   -9x2+24x+16=0   x1+x224/9 x1x2=-16/9   SPAQ  =SP'A'Q'  =(x1(-x2-4/3)-x2(-x1-4/3)/2  =2/3(x2-x1)  =2/3((x1+x22-4x1x2)  =162/9 
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