题目
若直线l:y=kx+1被圆x^2+y^2-2x-3=0截得的弦最短 则直线l方程是
提问时间:2021-03-11
答案
圆x^2+y^2-2x-3=0圆心为(1,0)
(k+1)绝对值/根号(1+k*k)=d
d*d=(k*k+2k+1)/(1+k*k)=1+2k/(1+k*k)
1+k*k>=2k(k>0时) 1+k*k>=-2k(k
(k+1)绝对值/根号(1+k*k)=d
d*d=(k*k+2k+1)/(1+k*k)=1+2k/(1+k*k)
1+k*k>=2k(k>0时) 1+k*k>=-2k(k
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