2/9: 3 2/3+4 2/5: (7/10+2 3//17-1 16/17: 11)=? 40 .

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