Question

Mình cần gấp ạ

Answer 1

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

2A-A=1-1/64

A=63/64

Answer 2

C=2/3-1/3+1/6+1/12+1/24+1/48+1/96

   =1/3+1/6+1/12+1/24+1/48+1/96

   =32/96+16/96+8/96+4/96+2/96+1/96

   =21/32

Answer 3

2D=1+1/2+1/4+1/8+1/32+1/64+1/128

2D-D=1-1/256

D=255/256