1)7/10 + 2 3/5 = 7/10 + 13/5 =(7 × 1 + 13 × 2)/10 = 7/10 + 26/10 = 33/10 = 3 3/10
2)1 16/17 ÷ 11 = 33/17 ÷ 11 = 33/17 × 1/11 = 3/17
3)3/17-3/17=0
4)2/9 ÷ 3 2/3 = 2/9 ÷ 11/3 = 2/9 × 3/11 = 2/33
5)4 2/5 ÷ 3 3/10 = 22/5 ÷ 33/10 = 22/5 × 10/33 = 4/3 = 1 1/3
6)2/33 + 1 1/3 = 2/33 + 4/3 =(2 × 1 + 4 × 11)/33 = 2/33 + 44/33 = 46/33 = 1 13/33
7)1 13/33-0=1 13/33
Ответ : 1 13/33