1 1/2加1/4 8分之1 1/16加1/32 64分之1 1/128加256分之1=多少怎么算
1/2加1/4加1/8加1/16加1/32加1/64加1/128加1/256 =1/2 1/4 1/8 1/16 1/32 1/64 1/128 1/256 =1/2^1 1/2^2 1/2^3 1/2^4 1/2^5 1/2^6 1/2^7 1/2^8 let S=1/2^1 1/2^2 1/2^3 1/2^4 1/2^5 1/2^6 1/2^7 1/2^8 (1) (1/2)S=1/2^2 1/2^3 1/2^4 1/2^5 1/2^6 1/2^7 1/2^8 1/2^9 (2) (1)-(2) (1/2)S = 1/2^1 - 1/2^9 S = 1 - 1/2^8...全部
1/2加1/4加1/8加1/16加1/32加1/64加1/128加1/256 =1/2 1/4 1/8 1/16 1/32 1/64 1/128 1/256 =1/2^1 1/2^2 1/2^3 1/2^4 1/2^5 1/2^6 1/2^7 1/2^8 let S=1/2^1 1/2^2 1/2^3 1/2^4 1/2^5 1/2^6 1/2^7 1/2^8 (1) (1/2)S=1/2^2 1/2^3 1/2^4 1/2^5 1/2^6 1/2^7 1/2^8 1/2^9 (2) (1)-(2) (1/2)S = 1/2^1 - 1/2^9 S = 1 - 1/2^8 = 255/256。
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