1-1/2-1/4-1/8-1/16-1/32-.1/256

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 1-1/2-1/4-1/8-1/16-1/32-.1/256 计算:1/2+1/4+1/8+1/16+1/32+...+1/256 等于多少, 1/2+1/4+1/8+1/16+1/32+...+1/256简便运算 1-(1/2)-(1/4)-(1/8)-(1/16)-(1/32)-(1/64)-(1/128)-(1/256) 1-1/2-4/1-1/8-1/16-1/32-1/64-1/128-1/256等于多少? 1-（1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256）等于（ ）. 1+1/2+1/4+1/8-1/16+1/32+1/64-1/128+1/256=?简便运算 1-1/2-1/4-1/8-1/16-1/32-1/64-1/128-1/256 要过程 急! 1+1/2+1/4+1/8-1/16+1/32+1/64-1/128+1/256