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�� 14.11. �� :�) (x - 2y)/(xy + y^2) + (2x - y)/(x^2 + xy); �) (3a + b)/(a^2 - ab) - (a + 3b)/(ab - b^2); �) (1 - x)/(x^2 - xy) - (y - 1)/(y^2 - xy);...

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14.11. �� :

�) (x - 2y)/(xy + y^2) + (2x - y)/(x^2 + xy);

�) (3a + b)/(a^2 - ab) - (a + 3b)/(ab - b^2);

�) (1 - x)/(x^2 - xy) - (y - 1)/(y^2 - xy);

�) (3 + c)/(c^2 - cd) + (3 + d)/(d^2 - cd);

�) (p - q)/(2p^2 + 2pq) + 2q/(p^2 - q^2);

�) (3m + n)/(9m^2 - 3mn) - 4n/(9m^2 - n^2).

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