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�� 67. �� :�) (m+n)/(m-n)+4mn/(n^2-m^2 ); �) (1-a)/(a^2-a)-(1+a)/(1-a^2 ); �) b/(ab-a^2 )+a/(ab-b^2 ); �) 4/(c^2-25)+2/(5c-c^2 ); �) ...

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67. �� :

�) (m+n)/(m-n)+4mn/(n^2-m^2 );

�) (1-a)/(a^2-a)-(1+a)/(1-a^2 );

�) b/(ab-a^2 )+a/(ab-b^2 );

�) 4/(c^2-25)+2/(5c-c^2 );

�) x^2/(x-3)^2 +x/(3-x);

�) y^2/(1-y)^2 -(y+1)/(y-1).

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