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1. 3 supra3 · 2 supra7 · 21supra18
2. 2supra7 ·4supra3 ·3supra ·1supra5



Răspuns :

 [tex]\\
1).\;\;1\,*\,3/3\,*\,2/7\,*\,21/18 =7/3\,;\\
2).\;\;2/7\,*\,4/3\,*\,1/5\,=(2*4*1)/(7*3*5)=8/105\;;[/tex]