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

Toán Lớp 7: a) |3x-1|=|x+3| b)|3x-1|=|x+5| c)|2x+1|-|3x-5|= 0

Toán Lớp 7: a) |3x-1|=|x+3| b)|3x-1|=|x+5| c)|2x+1|-|3x-5|= 0

Comments ( 1 )

  1. $\\$
    a,
    |3x-1| =|x+3|
    TH1 :
    -> 3x-1=x+3
    ->3x-x=1+3
    -> 2x=4
    ->x=2
    TH2 :
    -> 3x-1=-x-3
    ->3x+x=1-3
    -> 4x=-2
    ->x=(-1)/2
    Vậy x=2 hoặc x=(-1)/2
    $\\$
    b,
    |3x-1| = |x+5|
    TH1 :
    -> 3x-1=x+5
    -> 3x-x=1+5
    -> 2x=6
    -> x=3
    TH2 :
    -> 3x-1=-x-5
    ->3x+x=1-5
    -> 4x=-4
    ->x=-1
    Vậy x=3 hoặc x=-1
    $\\$
    c,
    |2x+1|-|3x-5|=0
    -> |2x+1|=|3x-5|
    TH1 :
    -> 2x+1=3x-5
    -> 2x-3x=-1-5
    -> -x=-6
    ->x=6
    TH2 :
    -> 2x+1=-3x+5
    -> 2x+3x=-1+5
    -> 5x=4
    ->x=4/5
    Vậy x=6 hoặc x=4/5

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