x^2+y^2+2mx-my-10m-25=0(x+m)^2+(y-m/2)^2=25+10m+5m^2/4圆心(-m,m/2)半径的平方=(m+5)^2+(m/2)^2假设定点是(a,b)则(a+m)^2+(b-m/2)^2=(m+5)^2+(m/2)^2a^2+2am+m^2+b^2-bm+m^2/4=25+10m+5m^2/4a^2+b^2+(2a-b)m=25+1...