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�� 78. �� :�) (ax-xy)/a :(a^2-ay)/x; �) (ab+ac)/bc :(ab-ac)/bc; �) x/(x^2-y^2 ) :1/(5x+5y); �) 1/(a^2-ab) :b/(a^2-b^2 ); �) (a^2+ab)/b^2 ...

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78. �� :

�) (ax-xy)/a :(a^2-ay)/x;

�) (ab+ac)/bc :(ab-ac)/bc;

�) x/(x^2-y^2 ) :1/(5x+5y);

�) 1/(a^2-ab) :b/(a^2-b^2 );

�) (a^2+ab)/b^2 :(a^2+a)/b;

�) (m^2-mn)/n :(mn-n^2)/m.

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