2/1+4/1+8/1+16/1+…+2n/1着急打错了…素1/2+1/4+1/8+1/16...+1/2^n
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2/1+4/1+8/1+16/1+…+2n/1着急打错了…素1/2+1/4+1/8+1/16...+1/2^n2/1+4/1+8/1+16/1+…+2n/1着急打错了…素1/2+1/4+1/8+1/1
2/1+4/1+8/1+16/1+…+2n/1着急打错了…素1/2+1/4+1/8+1/16...+1/2^n
2/1+4/1+8/1+16/1+…+2n/1
着急打错了…素1/2+1/4+1/8+1/16...+1/2^n
2/1+4/1+8/1+16/1+…+2n/1着急打错了…素1/2+1/4+1/8+1/16...+1/2^n
令S=2/1+4/1+8/1+16/1+…+2n/1------------1)
则2/S=4/1+8/1+16/1+…+2n/1+4n/1--------2)
1)式-2)式得
2/S=2/1-4n/1
s=1-2n/1=2n/(2n-1)
所以,2/1+4/1+8/1+16/1+…+2n/1=2n/(2n-1)
。。。。写错了?!
2/1???1/2+1/4+1/8+。。。+1/2^n
(1-1\2)+(1\2-1\4)+(1\4-1\8)+(1\8-1\16)+……+(1\n-1\2n)
=1-1\2n (打开括号,合并)
=(2n-1)\2n
2/1+4/1+8/1+16/1+32/1……+1024/1=
1/2+1/4+1/8+1/16+……+1/1024+1/2048=?
1/2+1/4+1/8=1/16+1/32+……+1/1024+2048
1/2+1/4+1/8+1/16+……+1/1024+1/2048=?]
1/2+1/4+1/8+1//16+1/32……1//128
1/2+1/4+1/8+1/16+……+1/2n的值
简便计算:1-1/2-1/4-1/8-1/16-1/32-…-1/1024
已知M=(2+1)(2^2+1)(2^4+1)(2^8+1) ……(2^16已知M=(2+1)(2^2+1)(2^4+1)(2^8+1)……(2^16+1)(2^128+1)
1/2+1/4+1/8+1/16+1/32+……+1/1024+1/2048+1/2^n
简便计算:1/2+1/4+1/8+1/16+……+1/256
1/2+1/4+1/8+1/16+……1/128=?要简便算法
1/2+1/4+1/8+1/16+……+1/256=( )
2/1+4/1+8/1+16/1+……+256/1=( )
1,1/2,1/4,1/8,1/16……第100个数是
计算:(2^2+1) (2^4+1) (2^8+1) (2^16+1)+……+(2^64+1)
简算:1/2+1/4+1/8+1/16+1/32+…+1/4096=()
如何证明1/2+1/4+1/8+1/16+…+1/(2^n)
求和:1/2-1/4+1/8-1/16+……+(-1)^n-1*1/2^n