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如图,MN是⊙O的直径,QN是⊙O的切线,连接MQ交⊙O于点H,E为上一点,连接ME,NE,NE交MQ于点F,且ME2=EF•EN. (1)求证:QN=QF; (2)若点E到弦MH的距离为1,c...
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