Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-7}{-13} . \left(\frac{-9}{2}\right)\\=-\frac{7.9}{13.2}\\=-\frac{63}{26}\)
2. \(\frac{-2}{-19} . \left(\frac{-3}{-7}\right)\\=+\frac{2.3}{19.7}\\=\frac{6}{133}\)
3. \(\frac{-11}{-15} . \left(\frac{9}{-12}\right)\\=-\frac{11}{15}.\frac{3}{4}\\=-\frac{11.3}{15.4}\\=-\frac{33}{60}\\=-\frac{11}{20}\)
4. \(\frac{-2}{-9} . \frac{12}{7}\\=+\frac{2.12}{9.7}\\=\frac{24}{63}\\=\frac{8}{21}\)
5. \(\frac{-2}{5} . \left(\frac{-4}{11}\right)\\=+\frac{2.4}{5.11}\\=\frac{8}{55}\)
6. \(\frac{-4}{-9} . \left(\frac{2}{-5}\right)\\=-\frac{4.2}{9.5}\\=-\frac{8}{45}\)
7. \(\frac{5}{11} . \left(\frac{12}{-5}\right)\\=-\frac{5.12}{11.5}\\=-\frac{60}{55}\\=-\frac{12}{11}\)
8. \(\frac{11}{-12} . \left(\frac{5}{-11}\right)\\=+\frac{11.5}{12.11}\\=\frac{55}{132}\\=\frac{5}{12}\)
9. \(\frac{7}{11} . \frac{11}{8}\\=+\frac{7.11}{11.8}\\=\frac{77}{88}\\=\frac{7}{8}\)
10. \(\frac{12}{5} . \frac{11}{6}\\=+\frac{12.11}{5.6}\\=\frac{132}{30}\\=\frac{22}{5}\)
11. \(\frac{-4}{-5} . \left(\frac{-2}{-10}\right)\\=+\frac{4}{5}.\frac{1}{5}\\=+\frac{4.1}{5.5}\\=\frac{4}{25}\)
12. \(\frac{-4}{-13} . \left(\frac{-4}{-10}\right)\\=+\frac{4}{13}.\frac{2}{5}\\=+\frac{4.2}{13.5}\\=\frac{8}{65}\)