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

Toán Lớp 7: Tìm `x` `a) x/2 + 1/3 = 61/147 – 8/98 + 1` `b) x/2 + x/3 = 15`

Toán Lớp 7: Tìm x
a) x/2 + 1/3 = 61/147 – 8/98 + 1
b) x/2 + x/3 = 15

Comments ( 2 )

  1. $ a) \dfrac{x}{2} + \dfrac{1}{3} = \dfrac{61}{147} – \dfrac{8}{98} + 1 $
    $ ⇒ \dfrac{x}{2} + \dfrac{1}{3} = \dfrac{4}{3} $
    $ ⇒ \dfrac{x}{2}= 1 $
    $ ⇒ x = 2 $
    Vậy $ x= 2 $
    $ b) \dfrac{x}{2} + \dfrac{x}{3} = 15 $
    $ ⇒ \dfrac{3x+2x}{6} = 15$
    $ ⇒ 5x = 90 $
    $ ⇒ x = 18 $
    Vậy $ x = 18 $
     

  2. a) x/2 + 1/3= 61/147 – 8/98 +1 = 4/3
    => x/2 = 4/3 – 1/3 = 1
    => x = 1×2=2
    b) x/2 + x/3 =15
    <=> (3x+2x)/6 =15
    <=> 5x = 90
    <=> x= 90/5=18
     

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

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