8. Tìm x a) 3/8 . x = 3/5 b) x . 5/3 = 11/3 c) x : 7/4 = 2/7 d) 3/5 : x = 6/5

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1. a)3/8 . x = 3/5

              x=3/5:3/8

              x=3/5.8/3

              x=8/5

   Vậy x=8/5

   b)x . 5/3 = 11/3

      x          =11/3:5/3

      x            = 11/3.3/5

     x           =11/5

   Vậy x=11/5

   c) x : 7/4 = 2/7

      x          =2/7.7/4

      x           =1/2

   Vậy x=1/2

   d) 3/5 : x = 6/5

                x  =3/5:6/5

                x=3/5.5/6

                x=1/2

   vậy x = 1/2

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2. `8`. `Tìm` `x`

   `a)` $\frac{3}{8}$ .`x` `=` $\frac{3}{5}$

   `<=>“x` `=` $\frac{3}{5}$ : $\frac{3}{8}$

   `<=>` `x` `=`$\frac{3}{5}$ .$\frac{8}{3}$

   `<=>` `x` `=` $\frac{8}{5}$

   `Vậy` `x` `=` $\frac{8}{5}$

   `b)` `x`. $\frac{5}{3}$ =$\frac{11}{3}$ 
   `<=>` `x` `=` $\frac{11}{3}$ : $\frac{5}{3}$ 
   `<=>` `x` `=` $\frac{11}{3}$. $\frac{3}{5}$
   `<=>` `x` `=` $\frac{11}{5}$
   `Vậy` `x` `=` $\frac{11}{5}$

   `c)` `x`: $\frac{7}{4}$ = $\frac{2}{7}$ 
   `<=>` `x` `=` $\frac{2}{7}$ . $\frac{7}{4}$ 
   `<=>` `x` `=` $\frac{2}{4}$ 
   `<=>` `x` `=` $\frac{1}{2}$
   `Vậy` `x` `=` $\frac{1}{2}$

   `d)` $\frac{3}{5}$ : `x` `=` $\frac{6}{5}$

   `<=>“x` ` =` $\frac{3}{5}$ : $\frac{6}{5}$

   `<=>` `x` `=`$\frac{3}{5}$ .$\frac{5}{6}$

   `<=>` `x` `=` $\frac{3}{6}$
   `<=>` `x` `=` $\frac{1}{2}$
   `Vậy` `x` `=` $\frac{1}{2}$

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