Question

Tính tổng S=3+3/2+3/2^2+3/2^3+...3/2^9

 

Answer 1

Ta có: S = 3+3/2+3/2^2+3/2^3+...+3/2^9

    1/2.S = 3/2+3/2^2+3/2^3+3/2^4+...+3/2^10

\(\Rightarrow\) S-1/2.S = 3 - 3/2^10

\(\Rightarrow\) 1/2.S = 3 - 3/2^10

\(\Rightarrow\) S = (3 - 3/2^10) : 1/2 

\(\Rightarrow\) S = 6 - 6/2^10

Nếu đúng thì cho mk biết nha

Answer 2

Bạn Đức Nguyễn Ngọc làm đúng đó bạn

Answer 3

ban duc nguyen ngoc lam dung day

Answer 4

\(S\Leftrightarrow\left(\frac{3}{2^{10}}-3\right):2\)

Answer 5

\(\Rightarrow S\Leftrightarrow\frac{3069}{512}\approx6\)