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1 supra 5 +(3 supra 20 - 1 supra 12) - (5 supra 6 - 49 supra 60)

Răspuns :

[tex]\frac{1}{5} +(\frac{3}{20} - \frac{1}{12} ) -(\frac{5}{6} - \frac{49}{60} )=[/tex]

= [tex]\frac{1}{5} +(\frac{9}{60} -\frac{5}{60})-(\frac{50}{60}-\frac{49}{60})[/tex]

= [tex]\frac{12}{60} +\frac{4}{60} -\frac{1}{60}[/tex]

= [tex]\frac{15}{60}[/tex] =  [tex]\frac{1}{4}[/tex]