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

Toán Lớp 7: 1/2.x+1/5=2/3x-1/4 giúp tui vs

Toán Lớp 7: 1/2.x+1/5=2/3x-1/4
giúp tui vs

Comments ( 2 )

  1. 1/2 . x + 1/5 = 2/3 . x – 1/4
    ⇔ 2/3 . x – 1/2 . x = 1/4 + 1/5
    ⇔ 1/6 . x = 9/20
    ⇔ x = 9/20 : 1/6
    ⇔ x = 27/10
    Vậy , x = 27/10 .

  2. Giải đáp:
    $\\$
    1/2x + 1/5 = 2/3 x – 1/4
    -> 1/2x – 2/3x = (-1)/5 – 1/4
    -> (1/2 – 2/3)x = (-4)/20 – 5/20
    -> (3/6 – 4/6)x = (-9)/20
    -> (-1)/6x = (-9)/20
    -> x=  (-9)/20 ÷ (-1)/6
    -> x= 27/10
    Vậy x=27/10
     

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

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