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

Toán Lớp 7: 1/2 (4/5 -3/2) +x=5(x-1/3) giúp mk vs

Toán Lớp 7: 1/2 (4/5 -3/2) +x=5(x-1/3)
giúp mk vs

Comments ( 2 )

  1. 1/2 . ( 4/5 – 3/2 ) + x = 5 . ( x – 1/3 )
    ⇔ 1/2 . ( – 7 )/10 + x = 5x – 5/3
    ⇔ ( – 7 )/20 + x = 5x – 5/3
    ⇔ 5x – x = 5/3 + ( – 7 )/20
    ⇔ 4x = 79/60
    ⇔ x = 79/60 : 4 
    ⇔ x = 79/240
    Vậy , x = 79/240 .
     

  2. Giải đáp:
    $\\$
    1/2 (4/5 – 3/2) +x = 5 (x-1/3)
    -> 1/2 (8/10 – 15/10) +x = 5x – 5/3
    -> 1/2 × (-7)/10 +x=5x-5/3
    -> x -7/20=5x-5/3
    -> x-5x=7/20-5/3
    -> (1-5)x=21/60 – 100/60
    -> -4x=(-79)/60
    -> x=(-79)/60 ÷ (-4)
    ->x=79/240
    Vậy x=79/240

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

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