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 hợp lý: a) -9,15 + 12,47 – 0,85 b) -31,14 + 14

Toán Lớp 6: Thực hiện phép tính hợp lý:
a) -9,15 + 12,47 – 0,85 b) -31,14 + 14,35 – (-21,14)-4,35
c) -4 . |-0,8| . 7,5 . |-12,5| d) [7,5 .(-3,5)-2,5 . 3,5] . 1,9 : (-17,5)

Comments ( 2 )

  1. a, $-9,15+12,47-0,85$
    $=-9,15-0,85+12,47$
    $=-10+12,47$
    $=2,47$
    b, $-31,14+14,35-(-21,14)-4,35$
    $=-31,14+14,35+21,14-4,35$

    $=-31,14+21,14+14,35-4,35$

    $=-10+10$
    $=0$

    c, $-4.|-0,8|.7,5.|-12,5|$

    $=-4.0,8.7,5.12,5$

    $=-4.7,5.(0,8.12,5)$

    $=-30.10$

    $=-300$

    d, $[7,5.(-3,5)-2,5.3,5].1,9:(-17,5)$
    $=-3,5(7,5+2,5).1,9:(-17,5)$

    $=-35.1,9:(-17,5)$

    $=-66,5:-17,5$

    $=3,8$

  2. a)-9,15+12,47-0,85
    =-9,15-0,85+12,47
    =-(9,15+0,85)+12,47
    =-10+10+2,47
    =2,47.
    b)-31,14+14,35-(-21,14)-4,35
    =-31,14+14,35+21,14-4,35
    =-31,14+21,14+14,35-4,35
     =-10-21,14+21,14+10+4,35-4,35
    =-10+0+10+0
    =0.
    c)-4.|-0,8|.7,5.|-12,5|
    =-4.0,8.7,5.12,5
    =-4.7,5.(0,8.12,5)
    =-30.10
    =-300
    d)[7,5.(-3,5)-2,5.3,5].1,9:(-17,5)
    =-3,5.[7,5-(-2,5)].1,9:(-17,5)
    =-3,5.(7,5+2,5).1,9:(-17,5)
    =-3,5.10.19:(-17,5)
    =-17,5.2.1,9:(-17,5)
    =3,8.(-17,5):(-17,5)
    =3,8.1
    =3,8.

Leave a reply

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