Răspunsuri

2014-08-05T17:50:13+03:00
X-varsta Denisei
y-varsta mamei
z-varsta tatei

x+27=y

y+1=z
y=z-1

x+27=z-1
x=z-1-27
x=z-28

z=5x

x=5x-28

x-5x= -28
-4x= -28

4x=28
x=7

z=5*7=35

y=35-1=34
1 5 1