Question

determinati numerele rationale x,y,z,stiind ca sunt direct proportionale cu 2,3 si 4 ,iar 2x+3y-z egal cu 27

Answer 1

x/2+y/3+z/4=k=>x=2k; y=3k; z=4k. 2*2k+3*3k-4k=27=>9k=27=>k=3=>x=6 y=9 z=12