Question

二分之一加四分之一加八分之一加十六分之一加三十二分之一（简算）

Answer 1

二分之一加上四分之一加上八分之一加上十六分之一加上三十二分之一
=1/32+1/16+1/8+1/4+1/2
=1／32＋1/32+1/16+1/8+1/4+1/2-1/32
=1／16+1/16+1/8+1/4+1/2-1/32
……
=1/2+1/2-1/32
=1-1/32
=31／32

Answer 2

1/2+1/4+1/8+1/16+1/32
=1/2+1/4+1/8+1/16+(1/32+1/32)-1/32
=1/2+1/4+1/8+1/16+1/16-1/32
=1/2+1/4+1/8+1/8-1/32
=1/2+1/4+1/4-1/32
=1/2+1/2-1/32
=1-1/32
=31/32