Question

va roggg
e urgent
dau coroana​

Answer 1

Explicație pas cu pas:

(12x-5y)/3x=2/3 => 3(12x-5y)=6x => 36x-15y=6x => 30x=15y => 2x=y => x/y=1/2 => x=k si y=2k

(x^2+xy)/y^2=(k^2+2k^2)/4k^2=3k^2/4k^2=3/4