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: ài 2: Tính hợp lí a, 1/3 + 4/6 – 12/12 b, (1,8 x 10) : 6 c, 1/2 x 2/4 + (-2/4) – (2021^0 + 4^3) d, 1 + 2 + 3 + 4 + 5 + … + 1000

Toán Lớp 6: ài 2: Tính hợp lí
a, 1/3 + 4/6 – 12/12
b, (1,8 x 10) : 6
c, 1/2 x 2/4 + (-2/4) – (2021^0 + 4^3)
d, 1 + 2 + 3 + 4 + 5 + … + 1000

Comments ( 2 )

  1. Bài $2$.
    $a$) 1/3 + 4/6 – {12}/{12}
    = 2/6 + 4/6 – 1
    = {2+4}/6 – 1
    = 6/6 – 1
    = 1 – 1 =0.
    $b$) $(1,8 \times 10) : 6$
    $= 18 : 6$
    $= 3$.
    $c$) $\dfrac{1}{2} \times \dfrac{2}{4} + (-\dfrac{2}{4}) – (2021^0 + 4^3)$
    $=\dfrac{1}{4} -\dfrac{1}{2} – (1 + 64)$
    =-1/4 – 65
    = {-1-260}/4
    = {-261}/4.
    $d$) $1+2+3+4+5+…..+1000$
    $= \dfrac{(1000+1).[(1000-1):1+1]}{2}$
    $= \dfrac{1001.1000}{2}$
    $= 1001.500$
    $= 500500$.
     

  2. a)1/3+4/6-12/12=1-12/12
                               =0
    b)(1,8×10):6=18:6
                        =3
    c)1/2×2/4+(-2/4)-(2021+4^3)
    =1/4+(-2/4)-(1+64)
    =-1/4-65
    = -261/4
    d)1+2+3+…+1000
    -số số hạng là:(1000-1):1+1=1000
    -tổng là: (1000+1).1000:2=500500
     

Leave a reply

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

About Linh