Question

Afla nr x stiind că:x+y=8, x+z=12, x+t=16, x+u=20,y+z+t+u=44

Answer 1

adunam primele 4 expresii=> 4x+y+z+t+u=56 inlocuind cu ultima expresie => 4x=56-44 => 4x=12=> x=3 => y=5; z=9; t=13 si u=17