Răspuns :
8 / 9 = 8 supra 9 ; unde / = linie de fractie
a) suma a doua fractii cu acelasi numitor
8 / 9 = 5 / 9 + 3 / 9
7 / 10 = 6 / 10 + 1/ 10
5 / 7 = 2 / 7 + 3 / 7
b) ca suma de trei fractii cu acelasi numitor
8 / 9 = 2 / 9 + 1 / 9 + 5 / 9
7 / 10 = 1 / 10 + 2 / 10 + 4 / 10
5 / 7 = 1 / 7 + 2 /7 + 2 / 7
c) ca suma de 5 fractii cu acelasi numitor
8 / 9 = 1 / 9 + 2 / 9 + 1 / 9 + 3 / 9 + 1 / 9
8 / 9 = 1 / 9 + 1 / 9 + 2/ 9 + 2 / 9 + 1 / 9 + 1 / 9
7 / 10 = 1 / 10 + 1 / 10 + 2 / 10 + 2 / 10 + 1 / 10
7 / 10 = 1 / 10 + 1 / 10 + 1/10 + 2 / 10 + 1 / 10 + 1 / 10 ( suma de 6 fractii)
5 / 7 = 1 / 7 + 1 / 7 + 1 / 7 + 1 / 7 + 1 / 7
5 / 7 = 1 / 7 + 1 / 7 + 1 / 7 + 1 / 7 + 1 / 7 + 0 / 7 → suma de 6 fractii cu acelasi numitor
a) suma a doua fractii cu acelasi numitor
8 / 9 = 5 / 9 + 3 / 9
7 / 10 = 6 / 10 + 1/ 10
5 / 7 = 2 / 7 + 3 / 7
b) ca suma de trei fractii cu acelasi numitor
8 / 9 = 2 / 9 + 1 / 9 + 5 / 9
7 / 10 = 1 / 10 + 2 / 10 + 4 / 10
5 / 7 = 1 / 7 + 2 /7 + 2 / 7
c) ca suma de 5 fractii cu acelasi numitor
8 / 9 = 1 / 9 + 2 / 9 + 1 / 9 + 3 / 9 + 1 / 9
8 / 9 = 1 / 9 + 1 / 9 + 2/ 9 + 2 / 9 + 1 / 9 + 1 / 9
7 / 10 = 1 / 10 + 1 / 10 + 2 / 10 + 2 / 10 + 1 / 10
7 / 10 = 1 / 10 + 1 / 10 + 1/10 + 2 / 10 + 1 / 10 + 1 / 10 ( suma de 6 fractii)
5 / 7 = 1 / 7 + 1 / 7 + 1 / 7 + 1 / 7 + 1 / 7
5 / 7 = 1 / 7 + 1 / 7 + 1 / 7 + 1 / 7 + 1 / 7 + 0 / 7 → suma de 6 fractii cu acelasi numitor