ex 4)
a)
x/3=y=4=z/6=k
x=3k
y=4k
z=6k
6k-4k+3k=10
5k=10=>k=2
x=3k=3•2=6
y=4k=4•2=8
z=6k=6•2=12
b)
x/3=y/4=z/6=k
x=3k
y=4k
z=6k
3x+4y-6z=4
1k=4=>k=4
x=3•4=12
y=4•4=16
z=6•4=24
c)
il faci la fel ca cele de mai sus,daca nu știi ți-l voi face in comentarii
5)
a)
(a,b,c)-->direct prop(4,5,6)
a=4k
b=5k
c=6k
4k+5k+6k=60
15k=60=>k=4=>a=4•4=16.
b=5•4=20
c=6•4=24
b)
(a,b,c)-->direct prop(4,5,6)
a=4k
b=5k
c=6k
4k+5k+6k=75
15k=75=>k=5
a=4•5=20
b=5•5=25
c=6•5=30
c)
a,b,c)-->direct prop(4,5,6)
a=4k
b=5k
c=6k
4k+5k+6k=90
15k=90=>k=6
a=4•6=24
b=5•6=30
c=6•6=36
