Question

Tinh :

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

Nhanh nhanh, ai tk mik thi mk tk lai

Answer 1

Tính A với:A=1+2+2²+2³+...+2⁹⁹+2¹⁰⁰

=>2A=2+2²+2³+2⁴+...+2¹⁰⁰+2¹⁰¹

=>2A-A=(2+2²+2³+2⁴+...+2¹⁰⁰+2¹⁰¹) - (1+2+2²+2³+...+2⁹⁹+2¹⁰⁰)

A=2¹⁰¹-1

Vậy A=2¹⁰¹-1

Answer 2

2A=2^2+2^3+2^4+.............+2^102

=> 2A-A=2^102-1

=> A=2^102-1

Ai tk mik, mik tk lai nha

Answer 3

hinh nhu ban lam lon de roi do