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

Toán Lớp 7: c) 4/3-1/2 nhân x = 4 d)1/2-2/3:x = 1/5

Toán Lớp 7: c) 4/3-1/2 nhân x = 4
d)1/2-2/3:x = 1/5

Comments ( 2 )

  1. $c) \dfrac{4}{3}-\dfrac{1}{2}x=4$
    $↔\dfrac{1}{2}x=\dfrac{4}{3}-4$
    $↔\dfrac{1}{2}x=-\dfrac{8}{3}$
    $↔x=\dfrac{-8}{3}:\dfrac{1}{2}$
    $↔x=\dfrac{-8}{3}.2$
    $↔x = \dfrac{-16}{3}$
    $d) \dfrac{1}{2}-\dfrac{2}{3}:x=\dfrac{1}{5}$
    $↔\dfrac{2}{3}:x=\dfrac{1}{2}-\dfrac{1}{5}$
    $↔\dfrac{2}{3}:x=\dfrac{3}{10}$
    $↔x=\dfrac{2}{3}:\dfrac{3}{10}$
    $↔x=\dfrac{2}{3}.\dfrac{10}{3}$
    $↔x=\dfrac{20}{9}$
     

  2. Giải:
    c) 4/3 – 1/2 * x = 4
    ⇔ 1/2 * x= 4/3 – 4 
    ⇔ x = (4/3 – 4)*2 = -16/3
    d) 1/2 – 2/3x = 1/5 
    ⇔ 2/3x = 1/2 -1/5
    ⇔ x = 2/(3*(1/2 -1/5)) 
    ⇔x = 20/9

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