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1-\frac{x^{2}-xy-y^{2}}{\left(x+y\right)\left(x-y\right)}
Aïlleu la x^{2}-y^{2}.
\frac{\left(x+y\right)\left(x-y\right)}{\left(x+y\right)\left(x-y\right)}-\frac{x^{2}-xy-y^{2}}{\left(x+y\right)\left(x-y\right)}
Per afegir o restar les expressions, amplieu-les perquè els denominadors coincideixin. Multipliqueu 1 per \frac{\left(x+y\right)\left(x-y\right)}{\left(x+y\right)\left(x-y\right)}.
\frac{\left(x+y\right)\left(x-y\right)-\left(x^{2}-xy-y^{2}\right)}{\left(x+y\right)\left(x-y\right)}
Com que \frac{\left(x+y\right)\left(x-y\right)}{\left(x+y\right)\left(x-y\right)} i \frac{x^{2}-xy-y^{2}}{\left(x+y\right)\left(x-y\right)} tenen el mateix denominador, resteu-los mitjançant la subtracció dels seus numeradors.
\frac{x^{2}-xy+yx-y^{2}-x^{2}+xy+y^{2}}{\left(x+y\right)\left(x-y\right)}
Feu les multiplicacions a \left(x+y\right)\left(x-y\right)-\left(x^{2}-xy-y^{2}\right).
\frac{xy}{\left(x+y\right)\left(x-y\right)}
Combineu els termes similars de x^{2}-xy+yx-y^{2}-x^{2}+xy+y^{2}.
\frac{xy}{x^{2}-y^{2}}
Expandiu \left(x+y\right)\left(x-y\right).
1-\frac{x^{2}-xy-y^{2}}{\left(x+y\right)\left(x-y\right)}
Aïlleu la x^{2}-y^{2}.
\frac{\left(x+y\right)\left(x-y\right)}{\left(x+y\right)\left(x-y\right)}-\frac{x^{2}-xy-y^{2}}{\left(x+y\right)\left(x-y\right)}
Per afegir o restar les expressions, amplieu-les perquè els denominadors coincideixin. Multipliqueu 1 per \frac{\left(x+y\right)\left(x-y\right)}{\left(x+y\right)\left(x-y\right)}.
\frac{\left(x+y\right)\left(x-y\right)-\left(x^{2}-xy-y^{2}\right)}{\left(x+y\right)\left(x-y\right)}
Com que \frac{\left(x+y\right)\left(x-y\right)}{\left(x+y\right)\left(x-y\right)} i \frac{x^{2}-xy-y^{2}}{\left(x+y\right)\left(x-y\right)} tenen el mateix denominador, resteu-los mitjançant la subtracció dels seus numeradors.
\frac{x^{2}-xy+yx-y^{2}-x^{2}+xy+y^{2}}{\left(x+y\right)\left(x-y\right)}
Feu les multiplicacions a \left(x+y\right)\left(x-y\right)-\left(x^{2}-xy-y^{2}\right).
\frac{xy}{\left(x+y\right)\left(x-y\right)}
Combineu els termes similars de x^{2}-xy+yx-y^{2}-x^{2}+xy+y^{2}.
\frac{xy}{x^{2}-y^{2}}
Expandiu \left(x+y\right)\left(x-y\right).