高三数学解答题难题突破圆锥曲线中的三点共线问题

3;0.0.120121914C:22(5)(2)8mxmymR()Cxm()m=4CyABAB4ykxM,N,1yBMGAGN.MB62MMkxyxx316MMxGkx316MMxAGxk2NNANxxkAGNAGAN3(2)6MNNMxxkxxk(3)6()MNMNkkxxxxAGN2.2017?y2=4xFFlABABMABMCDN1FNAB2BOCkOB==y1y2=4kOB=kOCBOC32017?C=1a0xC2CR40lCPQPPNCNFCNFQ==QN10CF10NFQ4.2017?x2+2y2=8yABABy=kx+4MNy=1BMG12AGN1.BQBPAQAP,QP,AB;2.ACAB//,ABAC,,1,OCOAOB,CBA,,3.1E+=1ae=Fc0A0EPQ1E2PxMMFQ3FPQPQ1acbab2PQy=kx33k2+1x218k2x+27k26=0PQ3PQx=my+3m2+3y2+6my+3=0Px1y1Qx2y2y1y2FPQ3PQx=my+3m2+3y2+6my+3=0