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 nhanh : ( 1+2+3+…+2021) . ( 13.15 – 12.15 -15 )

Toán Lớp 6: tính nhanh : ( 1+2+3+…+2021) . ( 13.15 – 12.15 -15 )

Comments ( 2 )

  1. (1+2+3+…+2021).(13.15-12.15-15)
    =(1+2+3+…+2021).(13.15-12.15-15.1)
    =(1+2+3+…+2021).[(13-12-1).15]
    =(1+2+3+…+2021).[0.15]
    =(1+2+3+…+2021).0
    =0

  2. #Mon
    (1+2+3+…+2021).(13.15-12.15-15)
    =(1+2+3+…+2021).15.(13-12-1)
    =(1+2+3+…+2021).15.0
    =0
     

Leave a reply

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