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Calculati diferenta intre suma a doua numere impare consecutive si diferenta lor.

Răspuns :

7+9= 16 
9-7= 2 
16-2 = 14 ( diferenta lor. )
Luam nr drept 2n+1 si 2n+3.
(2n+1+2n+3)+(2n+3-2n+1)=
4n+4+2=
4n+6