Помогите (1/2•3/4)•(2/3•4/5)•(5/6•7/8)•(6/7•8/9), (2/3•4/5)•(3/4•5/6)•(6/7•8/9)•(7/8•9/10)

Question

Помогите (1/2•3/4)•(2/3•4/5)•(5/6•7/8)•(6/7•8/9),
(2/3•4/5)•(3/4•5/6)•(6/7•8/9)•(7/8•9/10)

Answer 1

=3/8*8/15*35/48*16/21*8/15*5/8*16/21*63/80=1/45