Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: tính: 2+2^2+2^3+2^4+…+2^2020+2^2021

Toán Lớp 6: tính: 2+2^2+2^3+2^4+…+2^2020+2^2021

Comments ( 1 )

  1. Đặt A=2+2^2+2^3+…+2^2021
    Ta có : 
    A=2+2^2+2^3+2^4+…+2^2020+2021
    =>2A=2^2+2^3+2^4+…+2^2021+2^2022
    =>2A-A=(2^2+2^3+2^4+…+2^2021+2^2022)-(2+2^2+2^3+2^4+…+2^2020+2021)
    =>A=2^2022-2

Leave a reply

222-9+11+12:2*14+14 = ? ( )

About Melanie