高一数学求两个圆∶C₁∶x²+y²+2x+2y-2=0,C₂∶x²+y²-4x-2y+1=0的公切线有的条数?
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高一数学求两个圆∶C₁∶x²+y²+2x+2y-2=0,C₂∶x²+y²-4x-2y+1=0的公切线有的条数?
高一数学求两个圆∶C₁∶x²+y²+2x+2y-2=0,C₂∶x²+y²-4x-2y+1=0
的公切线有的条数?
高一数学求两个圆∶C₁∶x²+y²+2x+2y-2=0,C₂∶x²+y²-4x-2y+1=0的公切线有的条数?
C1: (x+1)^2+(y+1)^2=4
C2: (x-2)^2+(y-1)^2=4
所以两圆有2条公切线,为y=-1或y=3