问题描述：
1/52+47/52*51+47*48/52*51*50+47*46*45/52*51*50*49+...+47*46*45*...*2*1/52*51*50*...*6*5
1/52+47/52*51+47*48/52*51*50+47*46*45/52*51*50*49+.+47*46*45*.*2*1/52*51*50*.*6*5
1/52+47/52*51+47*48/52*51*50+47*46*45/52*51*50*49+.+47*46*45*.*2*1/52*51*50*.*6*5
问题解答：
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