Question

A=1/2+1/4+1/8+1/16+1/32+1/64.VẬY A=

 

Answer 1

2A=1+1/2+1/4+1/8+.........+1/512

2A-A=(1+1/2+1/4+1/8+....+1/512)-(1/2+1/4+1/8+.....+1/1024)

A=1-1/1024

A=1023/1024

vậy A=1023/1024

Answer 2

A=1-1/2+1/2-1/4+1/4-1/8+...+1/32-1/64

A=1-1/64

A=63/64

Answer 3

A=1/2+1/4+1/8+1/16+1/32+1/64.VẬY A=  63/64