1/128+1/64+1/32+…+1/4

1+2+4+8+16+32+64+128+256……加64次等于几 1+2+4+8+16+32+64+128+256…… 1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256 1/2-1/4-1/8-1/16-1/32-1/64-1/128-1/256 1/2-1/4-1/8-16/1-32/1-64/1-128/1-256/1 1/2+1/4+1/8+1/16+1/32+1/64+1/128=1-1/128 找规律 1+2+4+8+16+32+64+128+……2的n次方等于多少? 简便计算1/2+1/4+1/8+1/16+1/32+1/64+1/128 1/2+1/4+1/8+1/16+32/1+1/128没有1/64简算 1/2+1/4+1/8+1/16+1/32+1/64+1/128 计算:1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+……+1/2^n 1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256……+1/2^n 1 2 4 8 16 32 64 128 …叫什么（数学概念）?