Question

Gasiti trei numere x y z direct proportionale cu 2‚5si 3 asfel incat 4x-y+2z=783

Answer 1

{x,y,z}d.p. {2,5,3}
x/2=y/5=z/3=r
x=2r
y=5r
z=3r
4x-y+2z=783
4×2r-5r+2×3r=783
8r-5r+6r=783
9r=783
r=783/9
r=87
x=2×87=174
y=5×87=435
z=3×87=261