Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{8}{19} . \left(\frac{-8}{11}\right)\\=-\frac{8.8}{19.11}\\=-\frac{64}{209}\)
2. \(\frac{4}{17} . \frac{3}{7}\\=+\frac{4.3}{17.7}\\=\frac{12}{119}\)
3. \(\frac{-8}{3} . \left(\frac{-7}{5}\right)\\=+\frac{8.7}{3.5}\\=\frac{56}{15}\)
4. \(\frac{-10}{19} . \left(\frac{-10}{11}\right)\\=+\frac{10.10}{19.11}\\=\frac{100}{209}\)
5. \(\frac{-3}{-13} . \frac{7}{7}\\=+\frac{3}{13}.\frac{1}{1}\\=+\frac{3.1}{13.1}\\=\frac{3}{13}\)
6. \(\frac{-10}{-17} . \frac{10}{7}\\=+\frac{10.10}{17.7}\\=\frac{100}{119}\)
7. \(\frac{-5}{18} . \left(\frac{4}{-3}\right)\\=+\frac{5.4}{18.3}\\=\frac{20}{54}\\=\frac{10}{27}\)
8. \(\frac{-2}{-9} . \left(\frac{8}{-10}\right)\\=-\frac{2}{9}.\frac{4}{5}\\=-\frac{2.4}{9.5}\\=-\frac{8}{45}\)
9. \(\frac{-5}{-6} . \left(\frac{9}{-5}\right)\\=-\frac{5.9}{6.5}\\=-\frac{45}{30}\\=-\frac{3}{2}\)
10. \(\frac{-7}{-2} . \frac{4}{2}\\=+\frac{7}{2}.\frac{2}{1}\\=+\frac{7.2}{2.1}\\=\frac{14}{2}\\=\frac{7}{1}= 7\)
11. \(\frac{5}{6} . \left(\frac{-12}{7}\right)\\=-\frac{5.12}{6.7}\\=-\frac{60}{42}\\=-\frac{10}{7}\)
12. \(\frac{-3}{11} . \left(\frac{4}{-5}\right)\\=+\frac{3.4}{11.5}\\=\frac{12}{55}\)