求经过点A(1,2)且到原点的距离等于1的直线方程.
求经过点A(1,2)且到原点的距离等于1的直线方程.
数学人气:299 ℃时间:2019-08-22 19:17:29
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(1)当过点A(1,2)的直线与x轴垂直时,则点A(1,2)到原点的距离为1,所以x=1为所求直线方程.(2)当过点A(1,2)且与x轴不垂直时,可设所求直线方程为y-2=k(x-1),即:kx-y-k+2=0,由题意有|-k+2|k2+1=1,...
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