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

Toán Lớp 6: 3(x-1/2)-5(x+3/5)=-x+1/5 Giúp mình nhé. Tìm x

Toán Lớp 6: 3(x-1/2)-5(x+3/5)=-x+1/5
Giúp mình nhé. Tìm x

Comments ( 2 )

  1. 3( x – 1/2) – 5( x + 3/5) = -x + 1/5
    3x – 3 . 1/2 – 5x – 5 . 3/5 = -x + 1/5
    3x – 3/2 – 5x – 3 = -x + 1/5
    3x – 5x + x = 1/5 + 3/2 + 3
    ( 3 – 5 + 1)x = 2/10 + 15/10 + 30/10
    -1x =  47/10
    x = 47/10 : (-1)
    x = -47/10
    Vậy x = -47/10

  2. Giải đáp:
    x=- 47/10 
    Lời giải và giải thích chi tiết:
    3(x-1/2)-5(x+3/5)=-x+1/5
    ⇔ 3x – 3/2 – 5x – 3 + x – 1/5 = 0
    ⇔ -x – 3/2 – 3 – 1/5 = 0
    ⇔ -x – 15/10 – 30/10 – 2/10 = 0
    ⇔ -x – 47/10 = 0
    ⇔ -x = 47/10
    ⇔ x = – 47/10
    Vậy x=- 47/10
     

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