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1)Calculati : 1 supra 5 + 7 supra 36 - 1 supra 48

Răspuns :

[tex] \frac{1}{5} + \frac{7}{36} + \frac{1}{48} = \\ \frac{144}{720} + \frac{140}{720} + \frac{15}{720} = \\ \frac{299}{720} [/tex]