Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{-9}{-20} . \left(\frac{5}{-7}\right)\)
2. \(\frac{3}{13} . \left(\frac{-11}{-7}\right)\)
3. \(\frac{8}{15} . \left(\frac{-6}{3}\right)\)
4. \(\frac{7}{10} . \frac{4}{3}\)
5. \(\frac{-2}{3} . \left(\frac{-7}{-4}\right)\)
6. \(\frac{-8}{17} . \frac{6}{10}\)
7. \(\frac{-2}{-17} . \left(\frac{6}{-3}\right)\)
8. \(\frac{5}{17} . \left(\frac{-8}{9}\right)\)
9. \(\frac{-11}{-19} . \frac{5}{3}\)
10. \(\frac{12}{11} . \left(\frac{-2}{2}\right)\)
11. \(\frac{8}{13} . \left(\frac{-8}{-6}\right)\)
12. \(\frac{-11}{-7} . \left(\frac{-5}{-11}\right)\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-9}{-20} . \left(\frac{5}{-7}\right)\\=-\frac{9.5}{20.7}\\=-\frac{45}{140}\\=-\frac{9}{28}\)
2. \(\frac{3}{13} . \left(\frac{-11}{-7}\right)\\=+\frac{3.11}{13.7}\\=\frac{33}{91}\)
3. \(\frac{8}{15} . \left(\frac{-6}{3}\right)\\=-\frac{8}{15}.\frac{2}{1}\\=-\frac{8.2}{15.1}\\=-\frac{16}{15}\)
4. \(\frac{7}{10} . \frac{4}{3}\\=+\frac{7.4}{10.3}\\=\frac{28}{30}\\=\frac{14}{15}\)
5. \(\frac{-2}{3} . \left(\frac{-7}{-4}\right)\\=-\frac{2.7}{3.4}\\=-\frac{14}{12}\\=-\frac{7}{6}\)
6. \(\frac{-8}{17} . \frac{6}{10}\\=-\frac{8}{17}.\frac{3}{5}\\=-\frac{8.3}{17.5}\\=-\frac{24}{85}\)
7. \(\frac{-2}{-17} . \left(\frac{6}{-3}\right)\\=-\frac{2}{17}.\frac{2}{1}\\=-\frac{2.2}{17.1}\\=-\frac{4}{17}\)
8. \(\frac{5}{17} . \left(\frac{-8}{9}\right)\\=-\frac{5.8}{17.9}\\=-\frac{40}{153}\)
9. \(\frac{-11}{-19} . \frac{5}{3}\\=+\frac{11.5}{19.3}\\=\frac{55}{57}\)
10. \(\frac{12}{11} . \left(\frac{-2}{2}\right)\\=-\frac{12}{11}.\frac{1}{1}\\=-\frac{12.1}{11.1}\\=-\frac{12}{11}\)
11. \(\frac{8}{13} . \left(\frac{-8}{-6}\right)\\=+\frac{8}{13}.\frac{4}{3}\\=+\frac{8.4}{13.3}\\=\frac{32}{39}\)
12. \(\frac{-11}{-7} . \left(\frac{-5}{-11}\right)\\=+\frac{11.5}{7.11}\\=\frac{55}{77}\\=\frac{5}{7}\)