Question

Tính nhanh:

1/2 + 1/4 + 1/8 + 1/16 + 1/32

giúp mìn nha

Answer 1

1/2 + 1/4 + 1/8 + 1/16 + 1/32

=1-1/2+1/2-1/4+1/4-1/8+1/8-1/16+1/16-1/32

=1-1/32

=31/32

Answer 2

\(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}\)

\(=\frac{16}{32}+\frac{8}{32}+\frac{4}{32}+\frac{2}{32}+\frac{1}{32}\)

\(=\frac{16+8+4+2+1}{32}\)

\(=\frac{31}{32}\)

Vậy.......

Answer 3

Gọi tổng trên là A.

A=1/2+1/4+1/8+1/16+1/32

A+1/32=1/2+1/4+1/8+1/16+1/32+1/32

A+1/32=1/2+1/4+1/8+1/16+1/32+1/32

A+1/32=1/2+1/4+1/8+1/16+1/16

A+1/32=1/2+1/4+1/8+1/8

A+1/32=1/2+1/4+1/4

A+1/32=1/2+1/2

A+1/32=1

A=1-1/32

A=31/32