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 các tổng sau: B=8/9-2/72-2/56-2/42-2/30 Giúp mk vs ạ :3

Toán Lớp 6: Tính các tổng sau:
B=8/9-2/72-2/56-2/42-2/30
Giúp mk vs ạ :3

Comments ( 2 )

  1. Giải đáp:
     B = 32/45
    Lời giải và giải thích chi tiết:
     B = 8/9 – 2/72 – 2/56 – 2/42 – 2/30
    = 8/9 – (2/72 + 2/56 + 2/42 + 2/30)
    = 8/9 – [ 2 . (1/72 + 1/56 + 1/42 + 1/30)]
    = 8/9 – [ 2 . (1/(8.9) + 1/(7.8) + 1/(6.7) + 1/(5.6) ) ]
    =  8/9 – [ 2 . (1/8 – 1/9 + 1/7 – 1/8 + 1/6 – 1/7 + 1/5 – 1/6) ]
    =  8/9 – [ 2 . (1/5 – 1/9)]
    = 8/9 – 2 . 4/45
    = 8/9 – 8/45
    =  32/45

  2. B= 8/9-2/72-2/56-2/42-2/30
    B=8/9-1/36-1/28-1/21-1/15
    B=31/36-1/28-1/21-1/15
    B=52/36-1/21-1/15
    B=7/9-1/15
    B=32/45
     

Leave a reply

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

About Bảo Anh