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

Toán Lớp 7: A) 5/17-2/9-20/12-7/9+12/17 B)[6(-1/3)^2 -3(-1/3)+1]:(-1/3-1)

Toán Lớp 7: A) 5/17-2/9-20/12-7/9+12/17
B)[6(-1/3)^2 -3(-1/3)+1]:(-1/3-1)

Comments ( 2 )

  1. A) 5/17 – 2/9 – 20/12 – 7/9 + 12/17
    = (5/17 + 12/17)- (2/9 + 7/9) – 20/12
    = 1 – 1 – 20/12
    = -20/12
    B) [6.(-1/3)^{2} – 3.(-1/3) + 1] : (-1/3 – 1)
    = [ 6 . 1/9 + 1 + 1] : (-4/3)
    = 8/3 . (-3/4)
    = -2
     

  2. Bạn tham khảo
    a)
    5/17 – 2/9 – 20/12 – 7/9 + 12/17
    = 5/17 + 12/17 – 2/9 – 7/9 – 20/12
    = 1 – 1 – 20 /12
    =-20/12
    b) 
    [6(-1/3)^2 -3(-1/3)+1]:(-1/3-1)
    = (6 . 1/9 + 1+1) : (-4/3)
    = (2/3 + 1+1) . (-3/4)
    = 8/3 . (-3/4)
    = -2

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