-12x^3y^4÷(-3x^2y^3)·(-xy)=?
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-12x^3y^4÷(-3x^2y^3)·(-xy)=?
-12x^3y^4÷(-3x^2y^3)·(-xy)
=4xy·(-xy)
=-4x²y²
=4xy·(-xy)
=-4x²y²
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