设圆心坐标(T,-2T)察颂圆心到直线的衡搭距离等于圆的半径直线x-y-1=0|T-(-2T)-1|^2/1^2+(-1)^2=(T-2)^2+(-2T+1)^2(3T-1)^2/败拦郑2=(T-2)^2+(-2T+1)^2化简T^2-10T+9=0T=1 T=9T=1 (X-1)^2+(Y+2)^2=2T=9 (X-9)^2+(Y+18)^2=338
好简单啊,过点后代式解就0K呀!!