(5m-2n) 10k^2
-------- * -------- = k
10k (5m-2n)
(p+3) 4(p-2) 4
------- * -------- = ------
p(p-2) (p+3) p
(a-b)(a+b) ab a-b
-------------- * ------- = -----------
2ab (a+b) 2
(a-4)(a+4) ( a-3)
-------------- * ----------- = a-4
(a-3) (a+4)
(y-9) y^2-16y+64 (y-9) (y-8)^2 y-8
------ * ---------------- = -------------------- = -------
(y-8) (y-9)(y+9) ( y-8)(y-9)(y+9) y+9
(x+7y)(x-7y) x
---------------- * ------- = x(x+7y)
1 ( x-7y)
--------------- *