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(1supra2-1supra3) + (1supra4-1supra5) + (1supra5 - 1supra6) = ?

Răspuns :

(1-2)+(4-5)+(5-6)=(-1)+(-1)+(-1)=-3
(1supra2-1supra3) + (1supra4-1supra5) + (1supra5 - 1supra6)= =(3/6-2/6)+(5/20-4/20)+(6/30-5/30) =1/6+1/20+1/30 =3/18+8/180+6/180 =11/18+6/180 =17/80