Question

numarul x , y ,z sunt direct proportionale cu 3 , 4 ,5 aflati daca x +2 y + 3z e egal cu 78
va rog dau coroana ​

Answer 1

Răspuns:

{x,y,z} d.p {3,4,5}

x/3=y/4=z/5=k

x/3=k=>x=3k

y/4=k=>y=4k

z/5=k=>z=5k

acum înlocuim:

x+2y+3z=78

3k+2×4k+3×4k=78

3k+8k+12k=78

23k=78

k=78:3

k=26

x=3×26=78

y=4×26=104

z=5×26=130