化简-2[(-x)^ 2y]^2 (-3x^m y^n)
问题描述：
化简-2[(-x)^ 2y]^2 (-3x^m y^n)
答
-2[(-x)^ 2y]^2 (-3x^m y^n)
=-2(x^2y)^2 (-3x^m y^n)
=(-2)*(-3)*x^4y^2*x^my^n
=6x^(4+m)*y^(2+n)