Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-12}{11} . \left(\frac{7}{-6}\right)\\=+\frac{12.7}{11.6}\\=\frac{84}{66}\\=\frac{14}{11}\)
2. \(\frac{-10}{-11} . \frac{3}{2}\\=+\frac{10.3}{11.2}\\=\frac{30}{22}\\=\frac{15}{11}\)
3. \(\frac{3}{-11} . \left(\frac{-12}{10}\right)\\=+\frac{3}{11}.\frac{6}{5}\\=+\frac{3.6}{11.5}\\=\frac{18}{55}\)
4. \(\frac{-4}{5} . \frac{8}{11}\\=-\frac{4.8}{5.11}\\=-\frac{32}{55}\)
5. \(\frac{6}{-7} . \left(\frac{-5}{11}\right)\\=+\frac{6.5}{7.11}\\=\frac{30}{77}\)
6. \(\frac{3}{19} . \frac{9}{5}\\=+\frac{3.9}{19.5}\\=\frac{27}{95}\)
7. \(\frac{-6}{19} . \frac{8}{4}\\=-\frac{6}{19}.\frac{2}{1}\\=-\frac{6.2}{19.1}\\=-\frac{12}{19}\)
8. \(\frac{-11}{-2} . \left(\frac{-4}{-7}\right)\\=+\frac{11.4}{2.7}\\=\frac{44}{14}\\=\frac{22}{7}\)
9. \(\frac{2}{5} . \frac{2}{7}\\=+\frac{2.2}{5.7}\\=\frac{4}{35}\)
10. \(\frac{-6}{-17} . \left(\frac{-5}{4}\right)\\=-\frac{6.5}{17.4}\\=-\frac{30}{68}\\=-\frac{15}{34}\)
11. \(\frac{8}{-3} . \left(\frac{7}{-10}\right)\\=+\frac{8.7}{3.10}\\=\frac{56}{30}\\=\frac{28}{15}\)
12. \(\frac{-6}{-13} . \left(\frac{2}{-11}\right)\\=-\frac{6.2}{13.11}\\=-\frac{12}{143}\)