Question

tính 

4/9 + 7/63

9 + 2/5

17/18 - 3/9

3 - 14/15

Answer 1

=5/9

= 47/5

= 11/18

= 31/15

Answer 2

5/9

47/5

11/18

31/15

Answer 3

4/9 + 7/63 = 28/63 + 7/63 = 35/63
9 + 2/5 = 45/5 + 2/5 = 47/5
17/18 - 3/9 = 17/18 - 6/18 = 11/18
3 - 14/15 = 75/15 - 14/15 = 61/15
LY: Tự rút gọn (nếu cần)

Answer 4

=28/63+7/63

=35/63

=5/9

45/5+2/5

=47/5

17/18-6/18

=11/18

45/15-14/15

=31/15

Answer 5

31/15

Answer 6

9 + 2/5 = 11/5

3 - 14/15 = 31/15

4/9 + 7/63 = 35/63

17/18 - 3/9 = 11/18