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

`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` `=` $\frac{1}{2}$