Question

Daca a supra 2 = 5 supra b . atunci calculati ab.
Daca 7 supra x = y supra 3 , calculati 3xy - 60 .
Daca a supra x = y supra b , atunci calculati 10ab supra 7xy.
Daca m supra a = n supra b , calculati 1 - mb supra 2an.

Lectia : Proportii.

Answer 1

a/2=5/b
ab=2*5=10

7/x=y/3   xy=7*3=21
3xy-60=3*21-60=63-60=3

a/x=y/b      ab=xy
10ab/7xy = 10/7

m/a=n/b      mb=an
1-mb/2an=1-an/2an=1-1/2=1/2