Fie nr rațional a=
[tex]( - 1) {}^{n} \times \frac{2}{3} + ( - 1) {}^{n + 1} \times \frac{3}{4} + ( - 1) {}^{n + 2} \times \frac{5}{6} [/tex]
Unde n€ N
Calculati
[tex] |a| [/tex]
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