Răspuns:
(3²²+3¹⁹)/(3¹⁹+3²⁰)=
[(3¹⁹(3³+1)] / [3¹⁹(1+3)]=se reduce si la numitor si la numitor 3¹⁹
(3³+1)/4=
(27+1)/4=28/4=7
