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

Toán Lớp 6: Tìm x, biết: a, 17-{-x+[-x-(-x)]}=-16 b, x-{[-x+(x+3)]}-[(x+3)-(x-2)]=0 c, (-x)+(-62)+(-46)=-14.

Toán Lớp 6: Tìm x, biết: a, 17-{-x+[-x-(-x)]}=-16
b, x-{[-x+(x+3)]}-[(x+3)-(x-2)]=0
c, (-x)+(-62)+(-46)=-14.

Comments ( 2 )

  1. a) 17-{-x+[-x-(-x)]}= -16
    17-{-x+[-x+x]} = 16
    17-(-x-0)= -16
    17-(-x) = -16
    17+ x= -16
          x  = -33
    Vậy x= -33
    ___________________________
    b) x-{-x+[x+3]} –  [(x+3)-(x-2)]= 0
    x- (-x+x+3)-(x+3-x+2) = 0
    x- 3-5= 0
    x- 8= 0
    x= 8
    Vậy x=8
    ___________________________
    c) (-x)+(-62)+(-46) = 14
    -x- 62- 46= -14
    -x-108= -14
    -x = -14+108
    -x  = 94
    x= -94
    Vậy x=-94

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

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