Question

Determinati nr a,b,c stiind ca sunt invers proportionalecu1/5,1/4 si 1 si a-2c=0,3

Answer 1

a·1/5=b·1/4=c=k
⇒a·1/5=k⇒a=k/1/5⇒a=k·5⇒a=5k;
⇒b·1/4=k⇒b=k/1/4⇒b=k·4⇒b=4k;
⇒c=k;
⇒a-2c=0,3
⇒5k-2k=0,3
⇒3k=0,3
⇒k=3/10/3
⇒k=3/10·1/3
⇒k=1/10;
⇒a=5k⇒a=5·1/10⇒a=5/10⇒a=1/2;
⇒b=4k⇒b=4·1/10⇒b=4/10⇒b=2/5;
⇒c=k⇒c=1/10;