将直线方程代入圆的方程,得到关于x的方程,因为是切线,方程只有一个解,
5x^2+(4k-10)x+k^2=0,(4k-10)^2-4*5*k^2=0
4k^2+80k-100=0
数学问题~The line y = 2x + k is a tangent to the circle x2 + y2
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