Question

Aflati numarul x y z stiind ca x+y z+z z+× sint direct proportionale cu nr. 6,9,12 si k x+y+z=27
clasa6

Answer 1

x+y/6=y+z/9=z+x/12=k
x+y=6k
y+z=9k
z+x=12k
x+y+y+z+z+x=6k+9k+12k
2(x+y+z)=27k
x+y+z=27                =>k=2
x+y=6x2=12
y+z=2x9=18
z+x=2x12=24
z=27-12=15
y=27-24=3
x=27-18=9