tolong di jaeab y pliss dengan jalan y

3mn + 2m^2 - n,^2
4mn - m^2 + n^2
-------------------------- +
7mn + m^2

d) 15u^3 t + u^2 t + t^2
6u^3 t + 2u^2 t + t
-------------------------------- -
9u,^3 t - u,^2 t + t^2 - t