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

Toán Lớp 6: tính hợp lý 3/ 24. (16 – 5) – 16. (24 – 5) 4/ 29. (19 – 13) – 19. (29 – 13) 5/ 31. (-18) + 31. ( – 81) – 31 6/ (-12).47 + (-12). 52 +

Toán Lớp 6: tính hợp lý
3/ 24. (16 – 5) – 16. (24 – 5)
4/ 29. (19 – 13) – 19. (29 – 13)
5/ 31. (-18) + 31. ( – 81) – 31
6/ (-12).47 + (-12). 52 + (-12)
7/ 13.(23 + 22) – 3.(17 + 28)
8/ -48 + 48. (-78) + 48.(-21)
tính họp lý nha, đừng hiểu lầm là tính theo thứ tự các số nguyên đâu nha

Comments ( 2 )

  1. 3,
    24 . ( 16 – 5 ) – 16 . ( 24 – 5 )
    = 24 . 16 – 24 . 5 – 16 . 24 + 16 . 5
    = ( 24 . 16 – 16 .24 ) – ( 24 .5 + 16 .5 )
    = 0 – ( 24 .5 + 16 . 5 )
    = – 24 .5 + 16 . 5
    = 5 . ( – 24 + 16 )
    = 5 . ( – 8 )
    = – 40.
    4,
    29 . ( 19 – 13 ) – 19 . ( 29 – 13 )
    = 29 . 19 – 29 . 13 – 19 . 29 + 19 . 13
    = ( 29 .19 – 19 . 29 ) + ( 19 . 13 – 29 .13 )
    = 0 + ( 19 .13 – 29 . 13 )
    = 19 . 13 – 29 . 13
    = 13 . ( 19 – 29 )
    = 13 . ( – 10 )
    = – 130.
    5,
    31 . ( – 18 ) + 31 . ( – 81 ) – 31
    = 31 . ( – 18 –  81 – 1 )
    = 31 . ( – 100 )
    = – 3100.
    6,
    ( – 12 ) . 47 + ( – 12 ) . 52 + ( – 12 )
    = ( – 12 ) . ( 47 + 52 + 1 )
    = ( – 12 ) . 100
    = – 1200.
    7,
    13 . ( 23 + 22 ) – 3 . ( 17 + 28 )
    = 13 . 45 – 3 . 45
    = 45 . ( 13 – 3 )
    = 45 . 10
    = 450.
    8,
    – 48 + 48 . ( – 78 ) + 48 . ( – 21 )
    = 48 . ( – 1 ) + 48 . ( – 78 ) + 48 . ( – 21 )
    = 48 . ( -1 – 78 – 21 )
    = 48 . ( – 100 )
    = – 4800.
    Xin CTLHN.Chúc bạn học giỏi :DDDDDDDDD
     

  2. 3/ 24. (16 – 5) – 16. (24 – 5)
    =24×16-5-16×24-5
    =(24×16-16×24)+5x(16-24)
    = 0+5x(-8)
    4/ 29. (19 – 13) – 19. (29 – 13)
     = 29×19-13-19×29-13
    = 13x(19-29)
    = 13x(-10)
    = -130
    5/ 31. (-18) + 31. ( – 81) – 31
    = 31x(-18-31-1)
    = 31x(-100)
    = -3100
    6/ (-12).47 + (-12). 52 + (-12)
    = (-12)x(47+52+1)
    = (-12)x100
    = -1200
    7/ 13.(23 + 22) – 3.(17 + 28)
    = 13×45-3×45
    = 45x(13-3)
    = 45×10
    = 450
    8/ -48 + 48. (-78) + 48.(-21)
    = 48x[(-1)+(-78)+(-21)]
    = 48x(-100)
    = -4800 
     

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

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