Упростите выражения.
\(2(x -y) - 3(x + y) - (5x - 4y) + 5(x - 2y) - (x - y)\)
\((1 + m)(1 - m)(1 + m^2)\)
\(-2(x + + 5y)\)
\(1-m^4\)
\(1+m^4\)
\(1-2m^4\)