定点m(5,3)向圆x²+y²-2x+6y+9=0所引切线的长是?
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定点m(5,3)向圆x²+y²-2x+6y+9=0所引切线的长是?
定点m(5,3)向圆x²+y²-2x+6y+9=0所引切线的长是?
定点m(5,3)向圆x²+y²-2x+6y+9=0所引切线的长是?
圆心坐标(1,-3)半径1.((5-1)^2+(3+3)^2+1)^0.5=53^0.5