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

Toán Lớp 6: (x+5/6).2 2/5-1 1/4=35% |X-1|-12/16=25%

Toán Lớp 6: (x+5/6).2 2/5-1 1/4=35%
|X-1|-12/16=25%

Comments ( 2 )

  1. ( x + 5/6 ) . 2 2/5 – 1 1/4 = 35%
    ⇔ ( x + 5/6 ) . 12/5 – 5/4 = 7/20
    ⇔ ( x + 5/6 ) . 12/5 = 7/20 + 5/4
    ⇔ ( x + 5/6 ) . 12/5 = 8/5
    ⇔ x + 5/6 = 8/5 : 12/5
    ⇔ x + 5/6 = 2/3
    ⇔ x = 2/3 – 5/6
    ⇔ x = ( – 1 )/6
    Vậy , x = ( – 1 )/6 .
    ___________________________________________
    | x – 1 | – 12/16 = 25%
    ⇔ | x – 1 | – 3/4 = 1/4
    ⇔ | x – 1 | = 1/4 + 3/4
    ⇔ | x – 1 | = 1
    ⇔ $\left[\begin{matrix}x – 1 = 1\\x – 1 = – 1\end{matrix}\right.$
    ⇔ $\left[\begin{matrix}x = 2\\x = 0\end{matrix}\right.$
    Vậy , x ∈ { 2 ; 0 } .

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    (x+5/6)*2 2/5-1 1/4=35%
    =>(x+5/6)*12/5-5/4=7/20
    =>(x+5/6)*12/5=8/5
    =>x+5/6=2/3
    =>x=(-1)/6
    |x-1|-12/16=25%
    =>|x-1|-3/4=1/4
    =>|x-1|=1
    =>x-1=1 hoặc $x-1=-1$
    =>         x=2                  x=0
    Vậy x in{2;0}.

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