【数学】计算1-1/2-1/4-1/8-…-1/64-1/128-1/256.如上.规律是什么?

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【数学】计算1-1/2-1/4-1/8-…-1/64-1/128-1/256.如上.规律是什么?
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【数学】计算1-1/2-1/4-1/8-…-1/64-1/128-1/256.如上.规律是什么?
【数学】计算1-1/2-1/4-1/8-…-1/64-1/128-1/256.
如上.规律是什么?

【数学】计算1-1/2-1/4-1/8-…-1/64-1/128-1/256.如上.规律是什么?
原式=1-(1-1/2)-(1/2-1/4)-(1/4-1/8)-……-(1/32-1/64)-(1/64-1/128)-(1/128-1/256)
=1-1+1/2-1/2+1/4-1/4+1/8-……-1/32+1/64-1/64+1/128-1/128+1/256
=1/256
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=1-(1-1/2)-(1/2-1/4)-(1/4-1/8)-……-(1/32-1/64)-(1/64-1/128)-(1/128-1/256)
=1-1+1/2-1/2+1/4-1/4+1/8-……-1/32+1/64-1/64+1/128-1/128+1/256
=1/256

1-1/2-1/4-1/8-…-1/64-1/128-1/256.=(1-1/2)-1/4-1/8-........1/64-1/128-1/256=
1/2-1/4-1/8-…-1/64-1/128-1/256=1/4-1/8-…-1/64-1/128-1/256=.......=1/128-1/256=1/256

1-1/2-1/4-1/8-…-1/64-1/128-1/256
=1-1/2-1/4-1/8-…-1/64-1/128-1/256-1/256+1/256
=1-1/2-1/4-1/8-…-1/64-1/128-(1/256+1/256)+1/256
=1-1/2-1/4-1/8-…-1/64-1/128-(1/128)+1/256
=1-1/2-1/4-1/8-...

全部展开

1-1/2-1/4-1/8-…-1/64-1/128-1/256
=1-1/2-1/4-1/8-…-1/64-1/128-1/256-1/256+1/256
=1-1/2-1/4-1/8-…-1/64-1/128-(1/256+1/256)+1/256
=1-1/2-1/4-1/8-…-1/64-1/128-(1/128)+1/256
=1-1/2-1/4-1/8-…-1/64-(1/128+1/128)+1/256
=1-1/2-1/4-1/8-…-1/64-(1/64)+1/256
=1-1/2-1/4-1/8-…-(1/64+1/64)+1/256
=1-1/2-1/4-1/8-…-(1/32)+1/256
=1-1/2-1/4-1/8-(1/8)+1/256
=1-1/2-1/4-(1/8+1/8)+1/256
=1-1/2-1/4-(1/4)+1/256
=1-1/2-(1/4+1/4)+1/256
=1-1/2-(1/2)+1/256
=1-(1/2+1/2)+1/256
=1-1+1/256
=1/256

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