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

Toán Lớp 6: tìm x nguyên 100:(2.(x+5)-1)=-5

Toán Lớp 6: tìm x nguyên 100:(2.(x+5)-1)=-5

Comments ( 2 )

  1. 100 : (2 . (x + 5) – 12) = (-5)
    (2 . (x + 5) – 12) = 100 : (-5)
    2 . (x + 5) – 12 = (-20)
    2 . (x + 5) = (-20) + 12
    2 . (x + 5) = (-8)
    (x + 5) = (-8) : 2
    x + 5 = (-4)
    x = (-4) – 5
    x = -9
    Vậy: x = {-9}

  2. $ 100 : [ 2 ( x + 5 ) – 12 ] = -5 $ 
    $ 2 ( x + 5 ) – 12 = 100 : ( -5 ) = -20 $ 
    $ 2 ( x + 5 ) = -20 + 12 = -8 $ 
    $ x + 5 = -8 : 2 = -4 $ 
    $ x = -4 – 5 = -9 $
     

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

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