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[几何] 请教2015湖北理14题第二问的证明

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hongxian posted 2015-7-11 14:45 |Read mode
14.如图,圆$C$与$x$轴相切于点$T(1,0)$,与$y$轴正半轴交于两点$A$,$B$($B$在$A$的上方),  且$\abs{AB}=2$.
(Ⅰ)圆$C$的标准方程为________________ ;
(Ⅱ)过点$A$任作一条直线与圆$O$:$x^2+y^2=1$相交于$M$、$N$两点,下列三个结论:
①$\dfrac{\abs{NA}}{\abs{NB}}=\dfrac{\abs{MA}}{\abs{MB}}$;  ②$\dfrac{\abs{NB}}{\abs{NA}}-\dfrac{\abs{MA}}{\abs{MB}}=2$;  ③$\dfrac{\abs{NB}}{\abs{NA}}+\dfrac{\abs{MA}}{\abs{MB}}=2\sqrt{2}$.
其中正确结论的序号是_________________. (写出所有正确结论的序号)
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kuing posted 2015-7-11 14:51

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original poster hongxian posted 2015-7-11 14:53
【答案】(Ⅰ)$(x-1)^2+(y-\sqrt{2})^2=2$;(Ⅱ)①②③

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其妙 posted 2015-7-11 17:12

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