Cho A=1/2+1/2^2+1/2^3+1/2^4+ ... +1/2^10. Chứng tỏ: A+1/2^10=1

bài 1:cho A=1/2+1/2^2+1/2^3+1/2^4+...........+1/2^10.chứng tỏ A+1/2^10=1