Question

помогите пожалуйста...​

Answer 1

9/10(•7) - 11/14(•5) = 63/70 - 55/70 = 8/70 = 4/35

8/15(•11) - 5/33(•5) = 88/165 - 25/165 = 63/165 = 21/55

29/42(•13) - 41/78(•7) = 377/546 - 287/546 = 90/546 = 45/173

8/21(•13) - 5/39(•7) = 104/273 - 35/273 = 69/273 = 23/91