方法一:
3/4*3/4*3/4+ 1/4*3/4*3/4*3+1/4*1/4*3/4*3=63/64
方法二:
1-1/4*1/4*1/4=63/64
方法一:
3/4*3/4*3/4+ 1/4*3/4*3/4*3+1/4*1/4*3/4*3=63/64
方法二:
1-1/4*1/4*1/4=63/64
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