Răspuns :
1 zi - 1/2
a2a zi 1/4
1/2+1/4= aducem la acelasi numitor si vom avea
2/4+1/4=3/4
4/4-3/4=1/4
a2a zi 1/4
1/2+1/4= aducem la acelasi numitor si vom avea
2/4+1/4=3/4
4/4-3/4=1/4