Răspuns:
Explicație pas cu pas:
a) x/2=y/5=3x/6=4y/20=(3x+4y)/(6+20)=52/26=2
x/2=2 x=4
y/5=2 y=10
b) x/4=y/9=5x/20=-y/-9=(5x-y)/(20-9)=88/11=8
x/4=8 x=32
y/9=8 y-72
c) x/2=y/3=z/4=(x+y+z)/(2+3+4)=18/9=2
x/2=2 x=4
y/3=2 y=6
z/4=2 z=8
d)
x/3=y/4=z/5=2y/8=3z/15=(x+2y+3z)/(3+8+15)=104/26=4
x/3=4 x=12
y/4=4 y=16
z/5=4 z=20