Question

пожалуйста помогите номер 161

Answer 1

1)(38-17)*(38+17)/(47*19)^2=21*55/893^2=1155/893^2

Answer 2

2)26*80/28*130=2080/3640=4/7

Answer 3

3)120*242/110*528=29040/58080=1/2

Answer 4

4)140*260/260*580=36400/150800=7/29