Question

1.So sánh: A=\(\frac{1}{2^1}+\frac{1}{2^2}+...+\frac{1}{2^{49}}+\frac{1}{2^{50}}\) và 1:

Answer 1

ta có 1/2^2<1/2

        1/2^3<1/2

.............

      1/2^50<1/2

\(\Rightarrow\)1/2*50>1/2^1+1/2^2+1/2^3+...........+1/2^50

\(\Rightarrow\)