分数简算（计算）.
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分数简算（计算）.分数简算（计算）.分数简算（计算）.10、=1/2+1/4+1/8+1/16+1/32+1/64+1/128+2/256=1/2+1/4+1/8+1/16+1/32+1/64+1/1
分数简算（计算）.
分数简算（计算）.
分数简算（计算）.
10、
=1/2+1/4+1/8+1/16+1/32+1/64+1/128+2/256
=1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/128
=1/2+1/4+1/8+1/16+1/32+1/64+1/64
=1/2+1/4+1/8+1/16+1/32+1/32
=1/2+1/4+1/8+1/16+1/16
=1/2+1/4+1/8+1/8
=1/2+1/4+1/4
=1/2+1/2
=1
11、=1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/256-1/256
==1/2+1/4+1/8+1/16+1/32+1/64+1/128+2/256-1/256
=1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/128-1/256
=1/2+1/4+1/8+1/16+1/32+1/64+1/64-1/256
=1/2+1/4+1/8+1/16+1/32+1/32-1/256
=1/2+1/4+1/8+1/16+1/16-1/256
=1/2+1/4+1/8+1/8-1/256
=1/2+1/4+1/4-1/256
=1/2+1/2-1/256
=1-1/256
=255/256