1/4+1/8+1/16+1/32+1/64+1/128= 用转化方法做.
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1/4+1/8+1/16+1/32+1/64+1/128=用转化方法做.1/4+1/8+1/16+1/32+1/64+1/128=用转化方法做.1/4+1/8+1/16+1/32+1/64+1/128
1/4+1/8+1/16+1/32+1/64+1/128= 用转化方法做.
1/4+1/8+1/16+1/32+1/64+1/128= 用转化方法做.
1/4+1/8+1/16+1/32+1/64+1/128= 用转化方法做.
=1/2*(1/2+1/4+1/8+1/16+1/32+1/64)=1/2*63/64=63/128