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: Thực hiện phép tính : 8/9 – 1/72 -1/56 – 1/42 -1/30 -1/26 – 1/12 -1/6 – 1/2

Tháng Mười Một 17, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: Thực hiện phép tính :
8/9 – 1/72 -1/56 – 1/42 -1/30 -1/26 – 1/12 -1/6 – 1/2

Comments ( 2 )

  1. quynhthanhnghi
    quynhthanhnghi
    17 Tháng Mười Một, 2022 at 2:00 sáng
    Reply
    8/9 – 1/72 – 1/56 – 1/42 – 1/30 – 1/26 – 1/12 – 1/6 – 1/2
    = ( 8/9 – 1/72 – 1/56 – 1/42 – 1/30 ) – ( 1/26 + 1/12 + 1/6 + 1/2 )
    = ( {2240 – 35 – 45 – 60 – 84}/2520 ) – ( {6 + 13 + 26 + 78}/156 )
    = 4/5 – 41/52
    = 3/260
    #dtkc

  2. thuminhthong
    thuminhthong
    17 Tháng Mười Một, 2022 at 2:00 sáng
    Reply
    Trường hợp 1
    : Nếu đề là :
    8/9 – 1/72 – 1/56 – 1/42 – 1/30 – 1/26 – 1/12 – 1/6 – 1/2
    Bài làm :
    8/9 – 1/72 – 1/56 – 1/42 – 1/30 – 1/26 – 1/12 – 1/6 – 1/2
     =  ( 8/9 – 1/72 – 1/56 – 1/42 –  1/30) – ( 1/26 + 1/12 + 1/6 + 1/2)
    =(2240/2520 – 35/2520- 45/2520 -60/2520 -84/2520) – (6/156 + 13/156 + 26/156 + 78/156)
    = 4/5 –   41/52
    = 3/260
    Trường hợp 2 :
    Nếu đề là :
    8/9 – 1/72 – 1/56 – 1/42 – 1/30 – 1/20 – 1/12 – 1/6 – 1/2
    Bài làm :
    8/9 – 1/72 – 1/56 – 1/42 – 1/30 – 1/20 – 1/12 – 1/6 – 1/2
    = 8/9 – ( 1/72 + 1/56 + 1/42 + 1/30 + 1/20 + 1/12 + 1/6 + 1/2)
    = 8/9 – ( 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56 + 1/72)
    = 8/9 – ( 1/( 1.2) + 1/( 2.3) +  1/( 3.4) + 1/(4,5) + 1/( 5.6) +  1/( 6.7) + 1/( 7.8) + 1/( 8.9))
    = 8/9 – ( 1 – 1/2 + 1/2 – 1/3 + 1/3 – 1/4 + 1/4 – 1/5 + 1/5 – 1/6 +  1/6 – 1/7 + 1/7 – 1/8 + 1/8 – 1/9)
    = 8/9 – ( 1 – 1/9)
    =8/9 – 8/9
    = 0

Leave a reply

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

Hiểu Vân

About Hiểu Vân