1 2 4 8 16 32 64 128......第2007个是多少?

1+2+4+8+16+32+64+128＝ 1+2+4+8+16+32+64+128简便算法 1+2+4+8+16+32+64+128+...= 1+2+4+8+16+32+64+128+256 128+64+32+16+8+4+2+1+2/1+4/1+8/1+16/1+32/1=? 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 1/2-1/4-1/8-1/16-1/32-1/64-1/128-1/256 1/2+1/4+1/8+1/16+1/32+1/64+1/128+.+1/1024 1-2/1-4/1-8/1-16/1-32/1-64/1-128/1 1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256 2/1+4/2+8/3+16/4+32/5+64/6+128/7+256/8 简便计算1/2+1/4+1/8+1/16+1/32+1/64+1/128 简算:1/2+1/4+1/8+1/16+1/32+1/64+1/128 1/2+1/4+1/8+1/16+1/32+1/64+1/128 2/1+4/1+8/1+16/1+32/1+64/1+128/1=? 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 简便运算