Răspuns:
Explicație pas cu pas:
a/3=b/5=c/6
abc=90=> a*b*c=90
3*5*6=90=>
=> a/3=b/5=c/6=90/90
a/3=90/90=> a/3=1/1=> a=3
b/5=90/90=>b/5=1/1=>b=5
c/6=90/90=>c/6=1/1=> c=6