zračunaj: a) \( \frac{4}{5}+\frac{5}{4} \), b) \( \frac{4}{5}-\frac{4}{9} \), c) \( \frac{3}{8}-\frac{1}{12} \), d) \( \frac{1}{5}+\frac{1}{20} \), e) \( 0.7+\frac{1}{4} \), f) \( \frac{5}{12}-0.4 \) rac̃unaj: a) \( \frac{13}{18}+\frac{17}{24} \), b) \( \frac{14}{25}-\frac{7}{30} \), c) \( \frac{9}{20}+\frac{15}{16} \), d) \( \frac{20}{27}-\frac{13}{18} \), e) \( \frac{13}{36}-\frac{7}{24} \), f) \( \frac{7}{12}+\frac{4}{15} \)

Prva zadaća: a) \( \frac{4}{5} + \frac{5}{4} = \frac{16}{20} + \frac{25}{20} = \frac{41}{20} \) ili 2.05. b) \( \frac{4}{5} - \frac{4}{9} = \frac{36}{45} - \frac{20}{45} = \frac{16}{45} \). c) \( \frac{3}{8} - \frac{1}{12} = \frac{9}{24} - \frac{2}{24} = \frac{7}{24} \). d) \( \frac{1}{5} + \frac{1}{20} = \frac{4}{20} + \frac{1}{20} = \frac{5}{20} = \frac{1}{4} \). e) \( 0.7 + \frac{1}{4} = 0.7 + 0.25 = 0.95 \). f) \( \frac{5}{12} - 0.4 = \frac{5}{12} - \frac{12}{30} = \frac{25}{60} - \frac{24}{60} = \frac{1}{60} \). Druga zadaća: a) \( \frac{13}{18} + \frac{17}{24} = \frac{104}{144} + \frac{102}{144} = \frac{206}{144} = \frac{103}{72} \). b) \( \frac{14}{25} - \frac{7}{30} = \frac{420}{750} - \frac{175}{750} = \frac{245}{750} = \frac{49}{150} \). c) \( \frac{9}{20} + \frac{15}{16} = \frac{144}{320} + \frac{300}{320} = \frac{444}{320} = \frac{37}{20} \). d) \( \frac{20}{27} - \frac{13}{18} = \frac{40}{54} - \frac{39}{54} = \frac{1}{54} \). e) \( \frac{13}{36} - \frac{7}{24} = \frac{13 \cdot 2}{72} - \frac{21}{72} = \frac{26}{72} - \frac{21}{72} = \frac{5}{72} \). f) \( \frac{7}{12} + \frac{4}{15} = \frac{105}{180} + \frac{48}{180} = \frac{153}{180} = \frac{51}{60} \).