x do 4 * y do 2 - 5y do -3 to wszystko dzielone na x do 4 * y do -3
[x^4 *y^2 -5y^(-3)]/x^4 *y^(-3) =
=x^4 *y^2/x^4 *y^(-3) - 5y^(-3)/x^4 *y^(-3) =
=y^[2-(-3)] - 5/x^4 =
=y^5 - 5x^(-4)
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[x^4 *y^2 -5y^(-3)]/x^4 *y^(-3) =
=x^4 *y^2/x^4 *y^(-3) - 5y^(-3)/x^4 *y^(-3) =
=y^[2-(-3)] - 5/x^4 =
=y^5 - 5x^(-4)
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