Zad.1
[tex]\frac{21}{8} +\frac{11}{7} =\frac{147}{56} +\frac{88}{56} =\frac{235}{56} \\\\\frac{147}{56} -\frac{88}{56}=\frac{59}{56} \\\\\frac{147}{56} +\frac{235}{56}=\frac{382}{56}[/tex]
Zad.2
[tex]\frac{31}{4} +\frac{23}{9} = \frac{279}{36} +\frac{92}{36}=\frac{371}{36} \\\\\frac{279}{36} -\frac{92}{36}=\frac{227}{36} \\\\\frac{371}{36}-\frac{227}{36}=\frac{144}{36}[/tex]
Zad.3
a)
[tex]\frac{27}{2} -\frac{23}{6} =\frac{162}{12} -\frac{46}{12} =\frac{116}{12}[/tex]
b)
[tex]\frac{51}{8}- \frac{34}{7} =\frac{357}{56}- \frac{272}{56}=\frac{85}{56}[/tex]
c)
[tex]7-(\frac{41}{5} -\frac{23}{6}) =7-(\frac{246}{30} -\frac{115}{30})=7-\frac{131}{30} =7-4\frac{11}{30} =2\frac{19}{30}[/tex]
d)
[tex](\frac{17}{3} +\frac{7}{4} )-(\frac{17}{3}- \frac{7}{4} )=(\frac{68}{12} +\frac{21}{12} )-(\frac{68}{12}- \frac{21}{12} )= \frac{89}{12}- \frac{47}{12}=\frac{42}{12}[/tex]
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Zad.1
[tex]\frac{21}{8} +\frac{11}{7} =\frac{147}{56} +\frac{88}{56} =\frac{235}{56} \\\\\frac{147}{56} -\frac{88}{56}=\frac{59}{56} \\\\\frac{147}{56} +\frac{235}{56}=\frac{382}{56}[/tex]
Zad.2
[tex]\frac{31}{4} +\frac{23}{9} = \frac{279}{36} +\frac{92}{36}=\frac{371}{36} \\\\\frac{279}{36} -\frac{92}{36}=\frac{227}{36} \\\\\frac{371}{36}-\frac{227}{36}=\frac{144}{36}[/tex]
Zad.3
a)
[tex]\frac{27}{2} -\frac{23}{6} =\frac{162}{12} -\frac{46}{12} =\frac{116}{12}[/tex]
b)
[tex]\frac{51}{8}- \frac{34}{7} =\frac{357}{56}- \frac{272}{56}=\frac{85}{56}[/tex]
c)
[tex]7-(\frac{41}{5} -\frac{23}{6}) =7-(\frac{246}{30} -\frac{115}{30})=7-\frac{131}{30} =7-4\frac{11}{30} =2\frac{19}{30}[/tex]
d)
[tex](\frac{17}{3} +\frac{7}{4} )-(\frac{17}{3}- \frac{7}{4} )=(\frac{68}{12} +\frac{21}{12} )-(\frac{68}{12}- \frac{21}{12} )= \frac{89}{12}- \frac{47}{12}=\frac{42}{12}[/tex]