1-1/2-1/4-1/8-1/16-1/32-1/64……-1/1024
1-1/2-1/4-1/8-1/16-1/32-1/64……-1/1024
1.1/2+1/4+1/8+1/16+1/32+1/64+……+1/512+1/1024=
1/2+1/4+1/8+1/16+1/32……+1/1024
2/1+4/1+8/1+16/1+32/1……+1024/1=
求和:1/2+1/4+1/8+1/16+1/32+1/64+.+1/1024=?
1/2+1/4+1/8+1/16+1/32+1/64+.+1024=?
1/4+1/8+1/16+1/32+……+1/1024=?
计算:1/2+1/4+1/8+1/16+………+1/1024
2,-4,8,-16,32,-64… 1 -1,2,-4,8,-16,32…
1-1/2+1/4-1/8+1/16-1/32+1/64-1/128+1/256-1/512+1/1024-1/2048
1+2+4+8+16+……+1024等于几?
速算与巧算1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512+1/1024+1/4