1-1/2+1/4-1/8+1/16-1/32+1/64-1/128+1/256求过程详解,关于错位相减法!

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1-1/2+1/4-1/8+1/16-1/32+1/64-1/128+1/256求过程详解,关于错位相减法!
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1-1/2+1/4-1/8+1/16-1/32+1/64-1/128+1/256求过程详解,关于错位相减法!
1-1/2+1/4-1/8+1/16-1/32+1/64-1/128+1/256求过程详解,关于错位相减法!

1-1/2+1/4-1/8+1/16-1/32+1/64-1/128+1/256求过程详解,关于错位相减法!
设:S = 1-1/2+1/4-1/8+1/16-1/32+1/64-1/128+1/256
则:(-1/2)S = -1/2+1/4-1/8+1/16-1/32+1/64-1/128+1/256-1/512
两式相减,有:【1-(-1/2)】S=1-(-1/512)
即:(3/2)S=513/512
则:S=171/256

属于分组求和,正项与负项两组,再用公式计算