x^2+y^2-2x+2y-3=0
圆O(x-1)^2+(y+1)^2=5
圆心O(1,-1)
x^2+y^2+4x-1=0
圆O'(x+2)^2+y^2=5
圆心O'(-2,0)
直线OO':y=kx+b
-1=k+b
0=-2k+b
k=1/3, b=2/3
OO'中点M(x',y')
x'=(1-2)/2...
x^2+y^2-2x+2y-3=0
圆O(x-1)^2+(y+1)^2=5
圆心O(1,-1)
x^2+y^2+4x-1=0
圆O'(x+2)^2+y^2=5
圆心O'(-2,0)
直线OO':y=kx+b
-1=k+b
0=-2k+b
k=1/3, b=2/3
OO'中点M(x',y')
x'=(1-2)/2...