Răspuns :
1)
2 / 4 = 1 / 4 + 1 / 4
5 / 9 = 2 / 9 + 3 / 9
3 / 3 = 2 / 3 + 1 / 3
2)
2 + 4 / 5 = ( 2 × 5) / 5 + 4 / 5 = 10 / 5 + 4 / 5 = 14 / 5
4 - 10 / 8 = 4 - 5 / 4 = 16 / 4 - 5 / 4 = 11 / 4
sau: 4 - 10 / 8 = 32 / 8 - 10 / 8 = 22 / 8 = 11 / 4
3)
a - 2 / 3 = 1 / 3
a = 1 / 3 + 2 / 3
a = 3 / 3
d - 4 / 7 = 3 / 7
d = 3 / 7 + 4 / 7
d = 7 / 7
d = 1 intreg
2 / 4 = 1 / 4 + 1 / 4
5 / 9 = 2 / 9 + 3 / 9
3 / 3 = 2 / 3 + 1 / 3
2)
2 + 4 / 5 = ( 2 × 5) / 5 + 4 / 5 = 10 / 5 + 4 / 5 = 14 / 5
4 - 10 / 8 = 4 - 5 / 4 = 16 / 4 - 5 / 4 = 11 / 4
sau: 4 - 10 / 8 = 32 / 8 - 10 / 8 = 22 / 8 = 11 / 4
3)
a - 2 / 3 = 1 / 3
a = 1 / 3 + 2 / 3
a = 3 / 3
d - 4 / 7 = 3 / 7
d = 3 / 7 + 4 / 7
d = 7 / 7
d = 1 intreg