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