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AxB=16
A+B=40
aflati:
2x([tex] \frac{1}{B} + \frac{1}{A} [/tex])


Răspuns :

[tex]2 \cdot ( \frac{1}{b}+ \frac{1}{a})=2 \cdot ( \frac{a}{ab}+ \frac{b}{ab})=2 \cdot \frac{a+b}{ab}=2 \cdot \frac{40}{16}=5. [/tex]