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�� 78. �� :�) (ac-cd)/ad�cd/(a^2-ad); �) (x^2-2x)/y^2 :(x^2 y-2xy)/4; �) (x^2-y^2)/x^2 :(3x+3y)/x; �) (xy+x^2)/8y�2x/(xy+y^2 ); �) ...

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78. �� :

�) (ac-cd)/ad�cd/(a^2-ad);

�) (x^2-2x)/y^2 :(x^2 y-2xy)/4;

�) (x^2-y^2)/x^2 :(3x+3y)/x;

�) (xy+x^2)/8y�2x/(xy+y^2 );

�) b/(c^2-bc) :b^3/(c^2-b^2 )

�) (m^2-n^2)/(2mn^2 ) �2mn/(3m-3n);

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

�) (p^2+2pq+q^2)/2p�2p/(p^2-q^2 ).

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