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a). 2 1supra2(+5supra4)-1,(5)

Răspuns :


[tex] \frac{21}{2} + \frac{5}{4} - 1.(5)[/tex]
[tex] \frac{21}{2} + \frac{5}{4 } - \frac{15 - 1}{9} [/tex]
[tex] \frac{21}{2} + \frac{5}{4} - \frac{14}{9} [/tex]

numitorul comun este 36 =>
[tex] \frac{378 + 45 - 56}{36} [/tex]


[tex] \frac{367}{36} [/tex]