3,5 : ( 1 9/49 - ( 3/7 )² )срочно

Question

3,5 : ( 1 9/49 - ( 3/7 )² )
срочно

Answer 1

1) 3/7*3/7=9/49
2) 19/49-9/49=10/9
3)35/10:10/49=35/10*49/10=343/20=17,15