> (+rat (make-rat 1 2) (make-rat 1 3))
(5 . 6)
> (mystery 1 5)
(93888 . 34560)
> (to-double (mystery 1 5))
2.716666666666667
> (to-double (mystery 1 10))
2.7182818011463845
> (mystery 1 10)
(18099969098565397826764800000 . 6658606584104736522240000000)
> (+rat (make-rat 1 2) (make-rat 1 2))
(4 . 4)
> (*rat (make-rat 1 2) (make-rat 2 1))
(2 . 2)
> (+rat (make-rat 1 2) (make-rat 1 2))
(1 . 1)
> (*rat (make-rat 1 2) (make-rat 2 1))
(1 . 1)
> (mystery 1 10)
(9864101 . 3628800)