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

Toán Lớp 7: Tìm `x` biết: `a)` `0,75x – 5/2x = -2/3` `b)` `|x+1/2| = 3/4`

Toán Lớp 7: Tìm x biết:
a) 0,75x – 5/2x = -2/3
b) |x+1/2| = 3/4

Comments ( 2 )

  1. a, 0,75x – 5/2 . x = -2/3
    ( 3/4 – 5/2 )x = -2/3
    -7/4x = -2/3
    x = -2/3 : -7/4
    x = -9/-21 = -3/-7
    b, l x + 1/2 l = 3/4
    TH1: x + 1/2 = 3/4
    x = 3/4 – 1/2 = 1/4
    TH2: x + 1/2 = -3/4
    x = -3/4 – 1/2
    x = -5/4
    Vậy x = 1/4 hoặc -5/4

  2. Giải đáp:
    a, 0,75x – 5/2 . x = -2/3
    ( 3/4 – 5/2 )x = -2/3
    -7/4x = -2/3
    x = -2/3 : -7/4
    x = -9/-21 = -3/-7
    b, l x + 1/2 l = 3/4
    TH1: x + 1/2 = 3/4           TH2: x + 1/2 = -3/4
    x = -3/4-  1/2                      x = 3/4 – 1/2 
    x = -5/4                               x =1/4
    Vậy x = 1/4 hoặc -5/4
     chúc bạn hoc tốt 
    mong đc hay nhất

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