Question

tính tổng S

S=2^1+2^2+2^3+...+2^100

 

Answer 1

S= 2¹+2²+2³+...+2¹⁰⁰

2S= 2²+2³+2⁴+...+2¹⁰⁰+2¹⁰¹

2S-S= (2²+2³+2⁴+...+2¹⁰⁰+2¹⁰¹)-(2¹+2²+2³+...+2¹⁰⁰)

S=2¹⁰¹-2¹

Answer 2

S=2^1+2^2+2^3+...+2^100

2S=2^2+2^3+2^4+...+2^101

2S-S=2^2+2^3+2^4+...+2^101-2^1-2^2-2^3-...-2^100

S=2^101-2^1

Answer 3

Ngu