2x^2y×(-4y)^3+(-2xy)^2×y^2-3xy×4xy^3=
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2x^2y×(-4y)^3+(-2xy)^2×y^2-3xy×4xy^3=2x^2y×(-4y)^3+(-2xy)^2×y^2-3xy×4xy^3=2x^2y×(-4y)^3+(-2xy)^2×y^2
2x^2y×(-4y)^3+(-2xy)^2×y^2-3xy×4xy^3=
2x^2y×(-4y)^3+(-2xy)^2×y^2-3xy×4xy^3=
2x^2y×(-4y)^3+(-2xy)^2×y^2-3xy×4xy^3=
2 x ² y （- 4 y ）³ + （- 2 x y）² · y ² - 3 x y · 4 x y ³
= - 2 x ² y · 64 y ² + 4 x ² y ² · y ² - 12 x ² y ⁴
= - 128 x ² y ⁴ + 4 x ² y ⁴ - 12 x ² y ⁴
= （- 128 + 4 - 12）x ² y ⁴
= - 136 x ² y ⁴
2x^2y×(-4y)^3+(-2xy)^2×y^2-3xy×4xy^3
=2x^2y*(-64y^3)+4x^2y^2*y^2-12x^2y^4
=-128x^2y^4+4x^2y^4-12x^2y^4
=-136x^2y^4
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