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x^2+y^2-6x-4y+5=0,(x-3)^2+(y-2)^2=8,與x+y+3=0平行直線設為x+y+a=0,點(3,2)到該直線距離為8^1/2,8=|3+2+a|^2/2,a=-1或a=-9,直線為x+y-1=0或x+y-9=0.
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