Question

punctele d,e,f
URGENT!

Answer 1

d)
x/2=y/6=z/9=k
x=2k
y=6k
z=9k
18k/27 - 6k/18 - 2k/12 = 9
Simplificam putin fractia : 2k/3 - k/3 - k/6 = 9
Numitor comun 6
4k-2k-k=54 =>k=54
=>x=108
=>y=324
=>z=486

e)
2a=3b
6a+9b=36 , simplificand-o avem 2a+3b=12 =>3b+3b=12 =>6b=12 =>b=2
2a=6 =>a=3

f)
2a=3b=4c=k
a=k/2
b=k/3
c=k/4
6a=6k/2=3k
9b=9k/3=3k
4c=4k/4=k
3k+3k-k=75
5k=75 =>k=15
=>a=15/2=7,5
=>b=15/3=5
=>c=15/4=3,75