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80- 3supra4 -1supra5



Răspuns :

[tex]80 - \frac{3}{4} - \frac{1}{5} = \frac{1600}{20} - \frac{15}{20} - \frac{4}{20} = \frac{1581}{20} [/tex]
[tex] \frac{1600}{20} - \frac{15}{20} - \frac{4}{20}= \frac{1581}{20} [/tex]