Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-5}{-8} . \frac{7}{12}\\=+\frac{5.7}{8.12}\\=\frac{35}{96}\)
2. \(\frac{-11}{-2} . \left(\frac{-6}{-11}\right)\\=+\frac{11.6}{2.11}\\=\frac{66}{22}\\=\frac{3}{1}= 3\)
3. \(\frac{9}{-7} . \left(\frac{-5}{-7}\right)\\=-\frac{9.5}{7.7}\\=-\frac{45}{49}\)
4. \(\frac{7}{10} . \left(\frac{-8}{3}\right)\\=-\frac{7.8}{10.3}\\=-\frac{56}{30}\\=-\frac{28}{15}\)
5. \(\frac{6}{-5} . \left(\frac{-3}{-11}\right)\\=-\frac{6.3}{5.11}\\=-\frac{18}{55}\)
6. \(\frac{-2}{17} . \left(\frac{-3}{-4}\right)\\=-\frac{2.3}{17.4}\\=-\frac{6}{68}\\=-\frac{3}{34}\)
7. \(\frac{3}{17} . \left(\frac{-5}{-5}\right)\\=+\frac{3}{17}.\frac{1}{1}\\=+\frac{3.1}{17.1}\\=\frac{3}{17}\)
8. \(\frac{-11}{7} . \left(\frac{2}{-8}\right)\\=+\frac{11}{7}.\frac{1}{4}\\=+\frac{11.1}{7.4}\\=\frac{11}{28}\)
9. \(\frac{-5}{9} . \left(\frac{-9}{-8}\right)\\=-\frac{5.9}{9.8}\\=-\frac{45}{72}\\=-\frac{5}{8}\)
10. \(\frac{-12}{-11} . \frac{9}{7}\\=+\frac{12.9}{11.7}\\=\frac{108}{77}\)
11. \(\frac{-2}{-3} . \left(\frac{10}{-5}\right)\\=-\frac{2}{3}.\frac{2}{1}\\=-\frac{2.2}{3.1}\\=-\frac{4}{3}\)
12. \(\frac{12}{-17} . \left(\frac{-4}{-6}\right)\\=-\frac{12}{17}.\frac{2}{3}\\=-\frac{12.2}{17.3}\\=-\frac{24}{51}\\=-\frac{8}{17}\)