从圆x^2+y^2-2x+4y+1=0外一点P(3,3)向圆引切线PT,T为切点,则|PT|=
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从圆x^2+y^2-2x+4y+1=0外一点P(3,3)向圆引切线PT,T为切点,则|PT|=
从圆x^2+y^2-2x+4y+1=0外一点P(3,3)向圆引切线PT,T为切点,则|PT|=
从圆x^2+y^2-2x+4y+1=0外一点P(3,3)向圆引切线PT,T为切点,则|PT|=
如此简单!圆的方程(x-1)^2+(y+2)^2=4 圆心(1,-2)则两点间的距离你不会算么?算出来了 再勾股定理下就出来了啊!
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