Tìm x a, 1/5 – x = 5/6 – 1/4 b, 1/10 – (x – 3/25) = 1/50

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1.    a,   $\frac{1}{5}$ – x= $\frac{5}{6}$- $\frac{1}{4}$

   ⇔$\frac{1}{5}$ – x= $\frac{7}{12}$

   ⇔ x = $\frac{1}{5}$ –  $\frac{7}{12}$

   ⇔ x = $\frac{-23}{60}$

    Vậy x = $\frac{-23}{60}$

   b, $\frac{1}{10}$ – (x-$\frac{3}{25}$)=$\frac{1}{5}$

   ⇔x-$\frac{3}{25}$ =$\frac{1}{10}$ – $\frac{1}{5}$

   ⇔x-$\frac{3}{25}$ =$\frac{2}{25}$

   ⇔ x= $\frac{2}{25}$ +$\frac{3}{25}$

   ⇔ x =$\frac{1}{5}$ 

   Vậy x =$\frac{1}{5}$ 

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2. a) 1/5 – x = 5/6 – 1/4

       1/5 – x = 7/12

                x = -23/60

    Vậy  x = -23/60

   b) 1/10 – (x – 3/25) = 1/50

                   x – 3/25  = 2/25

                               x = 1/5

   Vậy x = 1/5

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