Question

Question 20 please thank hou

Answer 1

`(9mn-6m)/(25-m^2)/(12mn)/(5+m)=(3m(3n-2))/(5^2-m^2)\cdot(5+m)/(3m\cdot4n)\\\\=(3n-2)/((5-m)(5+m))\cdot(5+m)/(4n)=(3n-2)/(4n(5-m))\to\boxed{C.}`