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Efectuați: a) [tex] \frac{3}{xy} [/tex] + [tex] \frac{10}{xy} [/tex]
b) [tex] \frac{a}{a-b} [/tex]+[tex] \frac{b}{a-b} [/tex]
Ajutatima va rog dau coroana


Răspuns :

[tex] \frac{3}{xy} + \frac{10}{xy} = \frac{3+10}{xy} = \frac{13}{xy} [/tex]
[tex] \frac{a}{a-b} + \frac{b}{a-b} = \frac{a+b}{a-b} [/tex]