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

Toán Lớp 6: a x -2/3 = 7/12 và câu 1/2 .x + 3/5 . [x-2]=3

Toán Lớp 6: a x -2/3 = 7/12 và câu 1/2 .x + 3/5 . [x-2]=3

Comments ( 2 )

  1. x – 2/3 = 7/12
    => x = 7/12 + 2/3
    => x = 5/4
    Vậy x = 5/4
    $\\$
    1/2 . x + 3/5 . (x – 2) = 3
    => 1/2 . x + 3/5 . x – 3/5 . 2 = 3
    => 1/2 . x + 3/5 . x – 6/5 = 3
    => (1/2 + 3/5) . x = 3 + 6/5
    => 11/10 . x = 21/5
    => x = 21/5 : 11/10
    => x = 42/11
    Vậy x = 42/11

  2. a)x – 2/3=7/12
       x         =7/12 + 2/3=7/12 + 8/12
       x         =15/12=5/4
    b)1/2 . x + 3/5 . [x-2]=3
    =3
    42/11
     

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