Question

Numerele x si y sunt direct proportionale cu 2 si 9.Calculati 2x+6y supra 25x-y

Answer 1

{x,y} d.p. {2,9}
x/2=y/9=K ⇒x=2k ; y=9k
2×(2k)+6×(9k) / 25×(2k)-9k=
=4k+54k / 50k-9k
=58k /41k  (simplificam cu k)
=58/41
/ inseamna SUPRA