若x的3M次方=4,Y的3n次方=5,求（x的2m次方）+（y的n次方）3—x的2m次方×y的n方的积等于多少?

(x^2m)^3+(y^n)^3-x^2m*y^n*x^4m*y^2n =x^6m+y^3n-x^6my^3n =(x^3m)^2+y^3n-(x^3m)^2*y^3n =4^2+5-4^2*5 =-59