1) 3/14 - 8/21 + 5/7= 27/98 - 32/98 + 35/98= (27 - 32 + 35)/98= 30/98= 15/49
2) 14/55 33/50 : 1 24/25= (14/55 33/50) / (1 + 24/25)= (462/2750) / (49/25)= (462/2750) * (25/49)= 11550/134750= 231/2695
3) -2 5/12 + 11/18 - 1/6= -29/12 + 11/18 - 1/6= -174/72 + 44/72 - 12/72= -142/72= -71/36
4) 11/40 : 1 7/26 35/39= 11/40 / 33/26 35/39= 11/40 26/33 35/39= 1001/34320
5) 2/15 - 1 1/5 + 4/3= 2/15 - 6/5 + 4/3= 2/15 - 18/15 + 20/15= 4/15
1) 3/14 - 8/21 + 5/7
= 27/98 - 32/98 + 35/98
= (27 - 32 + 35)/98
= 30/98
= 15/49
2) 14/55 33/50 : 1 24/25
= (14/55 33/50) / (1 + 24/25)
= (462/2750) / (49/25)
= (462/2750) * (25/49)
= 11550/134750
= 231/2695
3) -2 5/12 + 11/18 - 1/6
= -29/12 + 11/18 - 1/6
= -174/72 + 44/72 - 12/72
= -142/72
= -71/36
4) 11/40 : 1 7/26 35/39
= 11/40 / 33/26 35/39
= 11/40 26/33 35/39
= 1001/34320
5) 2/15 - 1 1/5 + 4/3
= 2/15 - 6/5 + 4/3
= 2/15 - 18/15 + 20/15
= 4/15