lam vay co duoc ko
1/2+1/4+1/8+... +1/512+1/1024=1-1/2+1/2-1/4+...+1/512-1/1024=1-1/1024=1/1023
1+1/2+1/4+1/8+...+1/1024
1+2+1+2+4+8+........+1024
1/2+1/4+1/8+...+1/512+1/1024
a=1/2-1/4+1/8-...-1/1024
1/2 - 1/4 - 1/8 - .... - 1/1024 tính
(1-1/2)+(1-1/4)+(1-1/8)+...+(1-1/1024)
C=1/2+1/4+1/8+1/16+...+1/1024
\(\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+...+\dfrac{1}{1024}\)