Question

Aflati numerele a b c stiind ca sunt invers proportionale cu 2 3 si 5 si 1 supra a +1 supra b + 1 supra c =90

Answer 1

2a = 3b = 5c = k
a=k/2
b=k/3
c=k/5
1:k/2 + 1:k/3 + 1:k/5= 90
2/k +3/k +5/k=90
10/k=90
k=1/9
a=1/18
b=1/27
c=1/45