Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{3}{-19} . \frac{7}{6}\\=-\frac{3.7}{19.6}\\=-\frac{21}{114}\\=-\frac{7}{38}\)
2. \(\frac{-4}{13} . \left(\frac{-6}{-8}\right)\\=-\frac{4}{13}.\frac{3}{4}\\=-\frac{4.3}{13.4}\\=-\frac{12}{52}\\=-\frac{3}{13}\)
3. \(\frac{-9}{4} . \left(\frac{5}{-7}\right)\\=+\frac{9.5}{4.7}\\=\frac{45}{28}\)
4. \(\frac{4}{3} . \left(\frac{-12}{6}\right)\\=-\frac{4}{3}.\frac{2}{1}\\=-\frac{4.2}{3.1}\\=-\frac{8}{3}\)
5. \(\frac{-10}{-17} . \frac{4}{8}\\=+\frac{10}{17}.\frac{1}{2}\\=+\frac{10.1}{17.2}\\=\frac{10}{34}\\=\frac{5}{17}\)
6. \(\frac{-2}{3} . \left(\frac{-8}{8}\right)\\=+\frac{2}{3}.\frac{1}{1}\\=+\frac{2.1}{3.1}\\=\frac{2}{3}\)
7. \(\frac{11}{18} . \left(\frac{-7}{6}\right)\\=-\frac{11.7}{18.6}\\=-\frac{77}{108}\)
8. \(\frac{8}{-15} . \left(\frac{-4}{-6}\right)\\=-\frac{8}{15}.\frac{2}{3}\\=-\frac{8.2}{15.3}\\=-\frac{16}{45}\)
9. \(\frac{-8}{3} . \left(\frac{-8}{8}\right)\\=+\frac{8}{3}.\frac{1}{1}\\=+\frac{8.1}{3.1}\\=\frac{8}{3}\)
10. \(\frac{9}{-19} . \left(\frac{-8}{-3}\right)\\=-\frac{9.8}{19.3}\\=-\frac{72}{57}\\=-\frac{24}{19}\)
11. \(\frac{-8}{-3} . \left(\frac{-8}{-6}\right)\\=+\frac{8}{3}.\frac{4}{3}\\=+\frac{8.4}{3.3}\\=\frac{32}{9}\)
12. \(\frac{-6}{-7} . \left(\frac{-7}{2}\right)\\=-\frac{6.7}{7.2}\\=-\frac{42}{14}\\=-\frac{3}{1}= 3\)