Question

Ai giúp mình câu này với ạ.

1+2+2^2+2^3+2^4+2^5+2^6+...+2^60

Mình cảm ơn trước nhé!

Answer 1

Đặt A = 1+2+2^2+2^3+....+2^60

2A = 2+2^2+2^3+2^4+.....+2^61

2A-A= ( 2+2^2+2^3+....+2^61)-(1+2+2^2+.....+2^60)

A = 2^61-1

Answer 2

http://olm.vn/hoi-dap/question/232902.html

Answer 3

2A = 2 + 2^2 + 2^3 + 2^4 +...+ 2^61

=> A = ( 2 + 2^2 + 2^3 + 2^4 +...+ 2^61 ) - ( 1 + 2 + 2^2 + 2^3 +...+ 2^60 )

=> A = 2^61 - 1

cho minh nhé

Answer 4

A=1+2+2²+2³+2⁴+....+2⁶⁰

2A=2(1+2+2²+2³+2⁴+....+2⁶⁰)

2A=2+2²+2³+2⁴+2⁵+....+2⁶¹

2A-A=2+2²+2³+2⁴+2⁵+....+2⁶¹ - (1+2+2²+2³+2⁴+....+2⁶⁰)

1A=2⁶¹-1

A=2⁶¹-1

Vậy A=2⁶¹-1

Nhớ tích ch0 mình nha !