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

Toán Lớp 6: a, 4/3+2/3 x = 16/3 b, (x+1/3) . (3/4 – 2x)=0 c, -4/5x + 4/3x =-4/3

Toán Lớp 6: a, 4/3+2/3 x = 16/3
b, (x+1/3) . (3/4 – 2x)=0
c, -4/5x + 4/3x =-4/3

Comments ( 2 )

  1. a. 4/3 + 2/3 . x = 16/3
                    2/3 . x = 16/3 – 4/3
                    2/3 . x = 4
                            x = 4 : 2/3
                            x = 6
    b. (x + 1/3) . (3/4 – 2.x) = 0
      @ x + 1/3 = 0
             x        = 0 – 1/3
             x        =  -1/3
      @ 3/4 – 2.x = 0
                     2.x  = 3/4 – 0
                    2.x   = 3/4
                       x= 3/4 : 2
                       x= 3/8
    c. -4/5 . x + 4/3 . x = -4/3
            (4/5 + 4/3) . x  =  -4/3
                    32/15 . x  = -4/3
                                x = -4/3 : 32/15
                                x = -5/2
    $@Sim$

  2. Giải đáp + Lời giải và giải thích chi tiết:
    a)
    4/3+2/3x=16/3
    ⇔2/3x=16/3-4/3
    ⇔2/3x=12/3
    ⇔2/3x=4
    ⇔x=6
    Vậy S={6}
    b)
    (x+1/3).(3/4-2x)=0
    $⇔\left[\begin{matrix}x+\dfrac{1}{3}=0\\ \dfrac{3}{4}-2x=0\end{matrix}\right.$
    $⇔\left[\begin{matrix}x=\dfrac{-1}{3}\\ x=\dfrac{3}{8}\end{matrix}\right.$
    Vậy S={-1/3;3/8}
    c)
    -4/5x+4/3x=-4/3
    ⇔-x(4/5-4/3)=-4/3
    ⇔-x(-8/15)=-4/3
    ⇔-x=5/2
    ⇔x=-5/2
    Vậy S={-5/2}
    #Study well

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

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