Odpowiedź:
Zadanie 5
[tex]a)\frac{2}{3} +\frac{6}{7} = \frac{14}{21} +\frac{18}{21} =\frac{32}{21} = 1\frac{11}{21} \\\\\frac{7}{8} +\frac{5}{6} =\frac{42}{48} +\frac{40}{48} =\frac{82}{48} =1\frac{34}{48} =1\frac{17}{24} \\\\b) 5\frac{1}{4} +\frac{5}{6} = 5\frac{3}{12} +\frac{10}{12}= 5\frac{13}{12} = 5+1 \frac{1}{12} = 6\frac{1}{12} \\\\1\frac{7}{9} +2\frac{3}{10} = 1\frac{70}{90} + 2\frac{27}{90}=3\frac{97}{90} = 3+ 1\frac{7}{90} = 4 \frac{7}{90} \\\\\\[/tex]
[tex]2\frac{7}{8} +3\frac{1}{6} = 2\frac{21}{24} +3\frac{4}{24} =5\frac{25}{24} = 5+1\frac{1}{24} = 6\frac{1}{24} \\\\c) \frac{8}{9} -\frac{2}{5} = \frac{40}{45} -\frac{18}{45} = \frac{22}{45} \\\\\frac{7}{8} - \frac{4}{5}= \frac{35}{40} - \frac{32}{40}= \frac{3}{40} \\\\4\frac{5}{6} -\frac{1}{4} = 4\frac{10}{12} -\frac{3}{12} = 4\frac{7}{12} \\[/tex][tex]d) 6\frac{8}{9} -1\frac{1}{2} = 6\frac{16}{18} - 1\frac{9}{18} = 5\frac{7}{18} \\\\8\frac{5}{7} - 3\frac{2}{5} = 8\frac{25}{35} - 3\frac{14}{35} = 5\frac{11}{35} \\\\4\frac{1}{4} - 4\frac{1}{6} = 4\frac{3}{12} - 4\frac{2}{12} = \frac{1}{12} \\\\[/tex]
Zadanie 6
[tex]6\frac{1}{5} - 1\frac{1}{4} = \frac{31}{5} -\frac{5}{4} = \frac{124}{20} -\frac{25}{20} =\frac{99}{20} = 4\frac{19}{20} = 4,95 kg \\\\[/tex]
Odp: Pomarańcze ważą 4,95 kg.
