Question

Aflanumerele x,y,z, care indeplinesc simultan conditiile
x+y=z
z-y=5
y-(x+15):5=0
ma ajuta cineva?

Answer 1

x+y=z
z-y=5⇒x=5 deoarece x=z-y iar z-y=5

y-(x+15):5=0
y-(5+15):5=0
y-20:5=0
y-4=0
y=4+0
y=4

z-4=5
z=5+4
z=9
 sau
x+y=z=5+4=9