Question

Determinati nr x stiind ca : 57 supra31 - 16 supra 31 =x -21 supra 31 . E urgent !!

Answer 1

( 57 -  16)  / 31 =   ( x -21)  / 31  pentru ca aven acelasi numitor 31 
⇒  57  -16 = x -21 
     41 = x - 21 
      x = 41 + 21  
      x =    62 

Answer 2

[tex] \frac{57}{31}- \frac{16}{31} = x- \frac{21}{31} \\ \\ \frac{41}{31}=x- \frac{21}{31} \\ \\ -x= \frac{-21-41}{31} \\ \\ -x=\frac{-62}{31} \\ -x=-2[/tex]