设圆心为(x,y)因为圆过点A(1,1),B(-3,5),所以圆心到这两点距离相等(x-1)^2+(y-1)^2=(x+3)^2+(y-5)^2x^2-2x+1+y^2-2y+1=x^2+6x+9+y^2-10y+258y=8x+32y=x+4（1）因为圆心在直线2x+y+2=0上y=-2x-2带入(1)-2x-2=x+4x=-2,...