Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{-4}{-19} . \frac{6}{2}\)
2. \(\frac{-4}{9} . \left(\frac{10}{-9}\right)\)
3. \(\frac{5}{11} . \left(\frac{9}{-9}\right)\)
4. \(\frac{9}{13} . \left(\frac{-2}{9}\right)\)
5. \(\frac{-4}{13} . \frac{12}{9}\)
6. \(\frac{11}{-18} . \left(\frac{-12}{11}\right)\)
7. \(\frac{8}{7} . \frac{12}{11}\)
8. \(\frac{-6}{19} . \left(\frac{9}{-4}\right)\)
9. \(\frac{-8}{-15} . \left(\frac{9}{-5}\right)\)
10. \(\frac{-9}{10} . \left(\frac{-8}{10}\right)\)
11. \(\frac{-6}{17} . \left(\frac{7}{-4}\right)\)
12. \(\frac{2}{-17} . \left(\frac{11}{-11}\right)\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-4}{-19} . \frac{6}{2}\\=+\frac{4}{19}.\frac{3}{1}\\=+\frac{4.3}{19.1}\\=\frac{12}{19}\)
2. \(\frac{-4}{9} . \left(\frac{10}{-9}\right)\\=+\frac{4.10}{9.9}\\=\frac{40}{81}\)
3. \(\frac{5}{11} . \left(\frac{9}{-9}\right)\\=-\frac{5}{11}.\frac{1}{1}\\=-\frac{5.1}{11.1}\\=-\frac{5}{11}\)
4. \(\frac{9}{13} . \left(\frac{-2}{9}\right)\\=-\frac{9.2}{13.9}\\=-\frac{18}{117}\\=-\frac{2}{13}\)
5. \(\frac{-4}{13} . \frac{12}{9}\\=-\frac{4}{13}.\frac{4}{3}\\=-\frac{4.4}{13.3}\\=-\frac{16}{39}\)
6. \(\frac{11}{-18} . \left(\frac{-12}{11}\right)\\=+\frac{11.12}{18.11}\\=\frac{132}{198}\\=\frac{2}{3}\)
7. \(\frac{8}{7} . \frac{12}{11}\\=+\frac{8.12}{7.11}\\=\frac{96}{77}\)
8. \(\frac{-6}{19} . \left(\frac{9}{-4}\right)\\=+\frac{6.9}{19.4}\\=\frac{54}{76}\\=\frac{27}{38}\)
9. \(\frac{-8}{-15} . \left(\frac{9}{-5}\right)\\=-\frac{8.9}{15.5}\\=-\frac{72}{75}\\=-\frac{24}{25}\)
10. \(\frac{-9}{10} . \left(\frac{-8}{10}\right)\\=+\frac{9}{10}.\frac{4}{5}\\=+\frac{9.4}{10.5}\\=\frac{36}{50}\\=\frac{18}{25}\)
11. \(\frac{-6}{17} . \left(\frac{7}{-4}\right)\\=+\frac{6.7}{17.4}\\=\frac{42}{68}\\=\frac{21}{34}\)
12. \(\frac{2}{-17} . \left(\frac{11}{-11}\right)\\=+\frac{2}{17}.\frac{1}{1}\\=+\frac{2.1}{17.1}\\=\frac{2}{17}\)