(18+a):5+39=50 cum se face

Răspuns :

( 18 + a ) : 5 + 39 = 50 
( 18 + a ) : 5 = 50 - 39
( 18 + a ) : 5 = 11
  18 + a = 11 · 5
  18 + a = 55 
   a = 55 - 18 
   a = 37

[tex] \it (18 + a):5 + 39 = 50 = = > \\ \it (18 + a):5 = 50 - 39 = = > \\ \it (18 + a):5 = 11 = = > \\ \it 18 + a = 11 \cdot 5 = = > \\ \it 18 + a = 55 = = > \\ \it a = 55 - 18 = = > \\ \it a = 37 \\ \\ S={37}[/tex]