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

Toán Lớp 6: Bài 2: Thực hiện các phép tính sau một cách hợp lý:

Toán Lớp 6: Bài 2: Thực hiện các phép tính sau một cách hợp lý:
c)4567 + (1234 – 4567) – 4
d)(3567 – 214) – 3567 e)(-2021) – (28 – 2021)
f)- (269 – 357) + (269 – 357)

Comments ( 2 )

  1. c ) 4567 + (1234 – 4567 ) – 4
    = 4567 + 1234 – 4567 – 4
    = ( 4567 – 4567 ) + ( 1234 – 4 )
    = 0 + 1230
    = 1230
    d ) (3567 – 214) – 3567
    = 3567 – 214 – 3567
    = ( 3567 – 3567 ) – 214
    = 0 – 214
    = -214
    e ) (-2021) – ( 28 – 2021 )
    = (-2021) – 28 + 2021
    = [(-2021) + 2021] – 28
    = 0 – 28
    = -28
    f ) -(269 – 357) + ( 269 – 357)
    = (-269) + 357 + 269 – 357
    = [(-269) + 269] + (357 – 357)
    = 0 + 0
    =0
    #dtkc
     

  2. c) 4567 + ( 1234 – 4567) – 4
    = 4567 + 1234 – 4567 – 4
    = ( 4567 – 4567) + ( 1234 – 4)
    = 0 + 1230
    = 1230
    d) ( 3567 – 214) – 3567
    = 3567 – 214 – 3567
    = ( 3567 – 3567) – 214
    = 0 – 214
    = – 214
    e) ( – 2021) – ( 28 – 2021)
    = ( – 2021) – 28 + 2021
    = ( 2021 – 2021) – 28
    = 0 – 28
    = – 28
    f) -( 269 – 357) + ( 269 – 357)
    = – 269 + 357 + 269 – 357
    = ( 269 – 269) + ( 357 – 357)
    = 0 + 0
    = 0
     

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

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