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a fost răspuns

Ex.12
Efectuati a/a-b - b/b+a

Răspuns :

Ardnaxela1
[tex] \frac{a}{a-b}- \frac{b}{b+a}= \frac{a}{a-b}- \frac{b}{a+b}= \frac{a*(a+b)-b*(a-b)}{(a-b)*(a+b)} = \frac{a^2+ab-ba+b^2}{a^2-b^2}= \frac{a^2+b^2}{a^2-b^2}[/tex]