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�� 57. �� :�) 4/x+20/(x^2-5x); x=-19; �) n^2/(mn-m^2 )-m/(n-m); m=-0,5; n=2,5; �) ...

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57. �� :

�) 4/x+20/(x^2-5x); x=-19;

�) n^2/(mn-m^2 )-m/(n-m); m=-0,5; n=2,5;

�) a/(a-c)-(2ac-c^2)/(a^2-ac); a=-100; c=-85;

�) (y^2+4)/(y^2-2y)-2/(y-2); y=1/6;

�) 2/(a^2+ab)+2/(b^2+ab); a=0,25; b=4;

�) 1/(xy-x^2 )-1/(y^2-xy); x=-0,17; y=100.

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