Tìm x, biết: a) 3/5 : x = 3 b) x : 52 = 113

a)  $\frac{3}{5}$: x =  3                                                 b) x : 52 = 113

       x = $\frac{3}{5}$  : 3                                                    x = 113 x 52

       x = $\frac{1}{5}$                                                           x = 5876