Question

A = 1/4 + 1/2 + 1/8 + 1/16 + ...( tong co 10 so hang )

Answer 1

tong tren co 10 so hang suy ra ps cuoi cung la 1/2014

Suy ra tong=1023/1024

Answer 2

2A=\(2x\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}+\frac{1}{256}+\frac{1}{512}+\frac{1}{1024}\right)\)

2A=\(1+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}+\frac{1}{256}+\frac{1}{512}\)

2A-A=\(1-\frac{1}{1024}\)

A=\(\frac{1023}{1024}\)