Question

Tính A = 2 + 2² + 2³ + ..... + 2⁹⁹ + 2¹⁰⁰

Answer 1

2A=2²+2³+2⁴+....+2¹⁰⁰+2¹⁰¹

2A-A=2¹⁰¹-2

A=2¹⁰¹-2

Tick nha

Answer 2

 A = 2 + 2^2 + 2^3 + ..... + 2^99 + 2^100

A.2 =  2^2 + 2^3 + ..... + 2^99 + 2^100 +2^101

A.2-A= 2^2 + 2^3 + ..... + 2^99 + 2^100+2^101- (2 + 2^2 + 2^3 + ..... + 2^99 + 2^100)

A   =  2^101-2