(3mn2−3n)−(−2n−m2+4mn2)если m=−3 и n=−3.

(3mn^2−3n)−(−2n−m^2+4mn^2)=

3mn^2−3n+2n+m^2-4mn^2=

-mn^2-n+m^2

-(-3)*(-3)^2-(-3)+(-3)^2=27+3+9=

39