Thực hiện phép tính: 1/(1-x)+1/(1+x)+2/(1+x^2)+4/(1+x^4)+8/(1+x^8)+16/(1+x^16)

=11−x+11+x+21+x2+41+x4+81+x8+161+x16=21−x2+21+x2+41+x4+81+x8+161+x16=41−x4+41+x4+81+x8+161+x16=81−x8+81+x8+161+x16=161−x16+161+x16=321−x32.