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

Toán Lớp 7: $|3x-2|=|2x-3|$ $-2/x = -x/8/25$ làm giúp vs ạ

Toán Lớp 7: $|3x-2|=|2x-3|$
$-2/x = -x/8/25$
làm giúp vs ạ

Comments ( 2 )

  1. 1.
    |3x-2| = | 2x-3|
    +)3x-2 = 2x-3
    => 3x-2x = -3+2
    => x = -1
    +) 3x-2 = -(2x-3)
    => 3x-2 = -2x+3
    => 3x+2x= 3+2
    => 5x= 5
    => x=1
    Vậy x in {-1; 1}
    2.
    (-2)/x = (-x)/(8/25)
    => -x. x =8/25 . (-2)
    => -x^2 = -16/25
    => x^2= 16/25
    +) x^2 =(4/5)^2
    => x= 4/5
    +) x^2  =(-4/5)^2
    => x= -4/5
    Vậy x in { 4/5 ; -4/5}

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