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: Câu 1: tính nhanh a)(67 – 5759 ) + 5759 b)(- 3023) – ( 765 – 3023 ) c) 631 +[587 – (287 + 231)] d) (- 524) – [(476 + 245) – 45]

Toán Lớp 6: Câu 1: tính nhanh
a)(67 – 5759 ) + 5759
b)(- 3023) – ( 765 – 3023 )
c) 631 +[587 – (287 + 231)]
d) (- 524) – [(476 + 245) – 45]

Comments ( 2 )

  1. a) (67 – 5759) + 5759
    = 67 – 5759 + 5759
    = 67
    b) (-3023) – (765 – 3023)
    = (-3023) – 765 + 3023
    = (-3023) + 3023 – 765
    = 0 – 765
    = -765
    c) 631 + [587 – (287 + 231)]
    = 631 + 587 – 287 – 231
    = (631 – 231) + (587 – 287)
    = 400 + 300
    = 700
    d) (-524) – [(476 + 245) – 45]
    = (-524) – 476 – 245 + 45
    = [(-524) – 476] – (245 – 45)
    = -1000 – 200
    = -1200

  2. $\text{#Shi}$
    a.
    ${(67 – 5759 ) + 5759}$
    ${=5692+5759}$
    ${=67}$
    b.
    ${(−3023)−(765−3023)}$
    $={−3023−(−2258)}$
    $={−3023+2258}$
    $={−765}$
    c.
    ${ 631 +[587 – (287 + 231)]}$
    $={631+587−518}$
    ${=631+69}$
    $={700}$
    d.
    ${(- 524) – [(476 + 245) – 45]}$
    $={−524−(721−45)}$
    $={−524−676}$
    $=-{1200}$

Leave a reply

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