(-2xy^2)^2×(-2x^2y)^3×(-x^2 z)÷(2x^3y^2)
=(4x^2y^4)×(-8x^6y^3)×(-x^2 z)÷(2x^3y^2)
=(4x^2y^4)×(8x^6y^3)×(x^2 z)÷(2x^3y^2)
=(4×8÷2)×x^(2+6+2-3)×y^(4+3-2)×z
=16x^7y^5z