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

Toán Lớp 7: |1/2 × x – 3/4| = |1/3 × x +1/4|

Toán Lớp 7: |1/2 × x – 3/4| = |1/3 × x +1/4|

Comments ( 2 )

  1. |1/2 × x – 3/4| = |1/3 × x +1/4|
    Xét 2 trường hợp:
    Th1:
    1/2 × x – 3/4 = 1/3 × x +1/4
    => 1/2 × x – 1/3 × x = 1/4 + 3/4
    => 1/6 × x = 1
    => x = 6
    Th2: 
    1/2 × x – 3/4 = – (1/3 × x +1/4)
    => 1/2 × x – 3/4 = -1/3 × x -1/4
    => 1/2 × x + 1/3 × x = -1/4 + 3/4
    => 5/6 × x = 1/2
    => x = 1/2 × 6/5
    => x = 3/5
    Vậy  x = 3/5 hoặc x = 6
    (Chúc bạn học tốt)
     

  2. $\\$
    |1/2 x – 3/4| = |1/3 x + 1/4|
    Trường hợp 1 :
    -> 1/2 x – 3/4 = 1/3x + 1/4
    -> 1/2 x – 1/3 x = 3/4 + 1/4
    -> 1/6 x = 1
    ->x=1 : 1/6
    ->x=6
    Trường hợp 2 :
    -> 1/2 x – 3/4 = (-1)/3 x – 1/4
    -> 1/2x + 1/3 x = 3/4 – 1/4
    -> 5/6 x =1/2
    ->x=1/2 : 5/6
    ->x=3/5
    Vậy x=6 hoặc x=3/5

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