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(x-2)2+(y-1)2=1 (x+1)2+(y-2)2=1 (x+2)2+(y-1)2=1 (x-1)2+(y+2)2=1
(x-1)2+(y+2)2=5 (x+1)2+(y+2)2=5 (x+1)2+(y-2)2=5 (x-1)2+(y-2)2=5
(x+3)2+(y-3)2=2 (x-1)2+(y+1)2=2 (x-2)2+(y+2)2=2 (x-3)2+(y+3)2=2
(x-1)(x-2)=x2-3x+2 x2-3x+2=(x-1)(x-2) x2+4x+4=x(x一4)+4 x2+y2=(x+y)(x―y)
(x-2)2+y2=1 (x+2)2+y2=1 (x-1)2+(y-3)2=1 x2+(y-2)2=1
(x+2)2+(y-2)2=1 (x-2)2+(y+2)2=1 (x+2)2+(y+2)2=1 (x-2)2+(y-2)2=1
(x-2)2+(y+1)2=1 (x-2)2+(y-1)2=1 (x-1)2+(y+2)2=1 (x+1)2+(y-2)2=1
(x-2)2+(y+1)2=1 (x-2)2+(y-1)2=1 (x-1)2+(y+2)2=1 (x+1)2+(y-2)2=1
(x+1)2+(y-2)2=9 (x-1)2+(y+2)2=3 (x+1)2+(y-2)2=3 (x-1)2+(y+2)2=9
(x-1)2+(y-2)2=5 (x-2)2+(y-1)2=8 (x-4)2+(y-1)2=6 (x-2)2+(y-1)2=5
(-3,-1)和 (5,5)为直径端点的圆的方程是( ) A.(x-1)2+(y+2)2=100B.(x-1)2+(y-2)2=100 (x-1)2+(y-2)2=25 (x+1)2+(y+2)2=25
(1,0), (3,0), (3,4),则△ABC的外接圆方程是( ) A.(x-2)2+(y-2)2=20 B.(x-2)2+(y-2)2=10 C.(x-2)2+(y-2)2=5 (x-2)2+(y-2)2=
(x-2)2+(y-1)2=25 (x-2)2+(y-1)2=5 (x-1)2+(y-2)2=25 (x-1)2+(y-2)2=5
(x-1)(x-2)=x2-3x+2 x2-3x+2=(x-1)(x-2) x2+4x+4=x(x一4)+4 x2+y2=(x+y)(x―y)