Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{-5}{16} . \left(\frac{-10}{-5}\right)\)
2. \(\frac{-8}{-5} . \left(\frac{-5}{12}\right)\)
3. \(\frac{5}{-12} . \left(\frac{-4}{11}\right)\)
4. \(\frac{-4}{-13} . \left(\frac{-4}{10}\right)\)
5. \(\frac{8}{-17} . \left(\frac{-2}{-11}\right)\)
6. \(\frac{-11}{18} . \frac{9}{11}\)
7. \(\frac{12}{-17} . \left(\frac{10}{-3}\right)\)
8. \(\frac{-11}{8} . \left(\frac{3}{-6}\right)\)
9. \(\frac{-7}{-19} . \left(\frac{-11}{3}\right)\)
10. \(\frac{-6}{11} . \frac{2}{12}\)
11. \(\frac{3}{-11} . \left(\frac{12}{-11}\right)\)
12. \(\frac{7}{5} . \left(\frac{-12}{3}\right)\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-5}{16} . \left(\frac{-10}{-5}\right)\\=-\frac{5}{16}.\frac{2}{1}\\=-\frac{5.2}{16.1}\\=-\frac{10}{16}\\=-\frac{5}{8}\)
2. \(\frac{-8}{-5} . \left(\frac{-5}{12}\right)\\=-\frac{8.5}{5.12}\\=-\frac{40}{60}\\=-\frac{2}{3}\)
3. \(\frac{5}{-12} . \left(\frac{-4}{11}\right)\\=+\frac{5.4}{12.11}\\=\frac{20}{132}\\=\frac{5}{33}\)
4. \(\frac{-4}{-13} . \left(\frac{-4}{10}\right)\\=-\frac{4}{13}.\frac{2}{5}\\=-\frac{4.2}{13.5}\\=-\frac{8}{65}\)
5. \(\frac{8}{-17} . \left(\frac{-2}{-11}\right)\\=-\frac{8.2}{17.11}\\=-\frac{16}{187}\)
6. \(\frac{-11}{18} . \frac{9}{11}\\=-\frac{11.9}{18.11}\\=-\frac{99}{198}\\=-\frac{1}{2}\)
7. \(\frac{12}{-17} . \left(\frac{10}{-3}\right)\\=+\frac{12.10}{17.3}\\=\frac{120}{51}\\=\frac{40}{17}\)
8. \(\frac{-11}{8} . \left(\frac{3}{-6}\right)\\=+\frac{11}{8}.\frac{1}{2}\\=+\frac{11.1}{8.2}\\=\frac{11}{16}\)
9. \(\frac{-7}{-19} . \left(\frac{-11}{3}\right)\\=-\frac{7.11}{19.3}\\=-\frac{77}{57}\)
10. \(\frac{-6}{11} . \frac{2}{12}\\=-\frac{6}{11}.\frac{1}{6}\\=-\frac{6.1}{11.6}\\=-\frac{6}{66}\\=-\frac{1}{11}\)
11. \(\frac{3}{-11} . \left(\frac{12}{-11}\right)\\=+\frac{3.12}{11.11}\\=\frac{36}{121}\)
12. \(\frac{7}{5} . \left(\frac{-12}{3}\right)\\=-\frac{7}{5}.\frac{4}{1}\\=-\frac{7.4}{5.1}\\=-\frac{28}{5}\)