Tìm x : a) X : 1/2 + 3/4 = 1 19/20 b) x + x x 1/3 + 5/18 = 1 1/6

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1. ${a,x:}$ $\dfrac{1}{2}+$ $\dfrac{3}{4}=$ $1\dfrac{19}{20}$

     ${x:}$ $\dfrac{1}{2}+$ $\dfrac{3}{4}=$ $\dfrac{39}{20}$

     ${x:}$ $\dfrac{1}{2}=$ $\dfrac{39}{20}-$ $\dfrac{3}{4}$

     ${x:}$ $\dfrac{1}{2}=$ $\dfrac{6}{5}$

     ${x=}$ $\dfrac{6}{5}$ x $\dfrac{1}{2}$

     ${x=}$ $\dfrac{3}{5}$

   ${b,x+x}$ x $\dfrac{1}{3}+$ $\dfrac{5}{18}=$ $1\dfrac{1}{6}$

      ${x+x}$ x $\dfrac{1}{3}+$ $\dfrac{5}{18}=$ $\dfrac{7}{6}$

      ${x+x}$ x $\dfrac{1}{3}=$ $\dfrac{7}{6}-$ $\dfrac{5}{18}$

      ${x+x}$ x $\dfrac{1}{3}=$ $\dfrac{8}{9}$

      ${x}$ x $(1+\dfrac{1}{3})=$ $\dfrac{8}{9}$

      ${x}$ x $\dfrac{4}{3}=$ $\dfrac{8}{9}$

      ${x=}$ $\dfrac{8}{9}:$ $\dfrac{4}{3}$

      ${x=}$ $\dfrac{2}{3}$

    ~Xin hay nhất~

    

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2. a)x:$\frac{1}{2}$ +$\frac{3}{4}$ =1$\frac{19}{20}$ 

   x:$\frac{1}{2}$ =1$\frac{19}{20}$ -$\frac{3}{4}$ 

   x:$\frac{1}{2}$ =1$\frac{1}{5}$ 

   x=1$\frac{1}{5}$ .$\frac{1}{2}$ 

   x=$\frac{3}{5}$ 

   b)x+x.$\frac{1}{3}$ +$\frac{5}{18}$=1 $\frac{1}{6}$

   x.(1+$\frac{1}{3}$ )=1$\frac{1}{6}$ -$\frac{5}{18}$ 

   x.1$\frac{1}{3}$ =$\frac{8}{9}$ 

   x=$\frac{8}{9}$ :1$\frac{1}{3}$ 

   x=$\frac{2}{3}$ 

    

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