(-2xy^2)^2×3x^2y÷(-x^3y^4)=
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(-2xy^2)^2×3x^2y÷(-x^3y^4)=(-2xy^2)^2×3x^2y÷(-x^3y^4)=(-2xy^2)^2×3x^2y÷(-x^3y^4)=(-2xy^2)^2×3x^2y÷(-
(-2xy^2)^2×3x^2y÷(-x^3y^4)=
(-2xy^2)^2×3x^2y÷(-x^3y^4)=
(-2xy^2)^2×3x^2y÷(-x^3y^4)=
(-2xy^2)^2×3x^2y÷(-x^3y^4)
=4x^2y^4×3x^2y÷(-x^3y^4)
=-12x^(2+2-3)y^(4+1-4)
=-12xy
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