共50条信息
一束光线\(l\)自\(A(1,0)\)发出,射到直线\(m\):\(x\)\(+\)\(y\)\(+1=0\)上,被直线\(m\)反射到圆\(x\)\({\,\!}^{2}+\)\(y\)\({\,\!}^{2}-6\)\(x\)\(-2\)\(y\)\(+9=0\)上的点\(B\).
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