👤

calculeaza cat mai repede posibil :1supra3+1supra4+1supra5+2supra3+3supra4+4supra5

Răspuns :

1/3 + 1/4 + 1/5 + 2/3 + 3/4 + 4/5 = 1

= ( 1/3 + 2/3) + ( 1/4 + 3/4) + ( 1/5 + 4/5) = 
                                          → folosesc asociativitatea adunarii
= 3/3 + 4/4 + 5/5 = 

= 1 + 1 + 1 =

= 3