-(-xmy)³•(xyn+1)²

-(-xmy)³•(xyn+1)²
-(-xmy)³•(xyn+1)²

-(-xmy)³•(xyn+1)²
-(-x^m·y)³•[x·y^(n+1)]²
=x^(3m)·y³•x²•y^(2n+2)
=x^(3m+2)•y^(2n+5)