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

Toán Lớp 6: tính hợp lý 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)

Toán Lớp 6: tính hợp lý
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
1/ (-6 – 2). (-6 + 2)
2/ (7. 3 – 3) : (-6)
3/ (-5 + 9) . (-4)
4/ 72 : (-6. 2 + 4)

Comments ( 2 )

  1. Bài 1
    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)
    =-1.48-48.78-48.21
    =48(-1-78-21)
    =48.(-100)
    =-4800
    Bài 2
    1) (-6 – 2 ).(-6 + 2)
    =-8 . -4
    =32
    2) (7.3.-3):-6
    =-63 : -6
    =10,5
    3) (-5 + 9).(-4)
    =4.-4
    =-16
    4) 72:(-6.2 + 4)
    =72 :-8
    =-9
    #thew#

  2. 1
    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 – 13 . 45
    =  45 ( 13 – 3 )
    = 45 . 10 = 450
     
    8/ -48 + 48. (-78) + 48.(-21)
    = 48 ( -1 -78 – 21 )
    = 48 . (-100 )
    = -4800
    2
    1/ (-6 – 2). (-6 + 2)
    = ( -6 )^2 – $2^{2}$ 
    = 36 – 4 = 32
    2/ (7. 3 – 3) : (-6)
    = 18 : ( -6 )
    = -3
     
    3/ (-5 + 9) . (-4)
    = -4 . ( -4)
    = 16
    4/ 72 : (-6. 2 + 4)
    = 72 : ( -16)
    = 4,5

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