Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-3}{-13} . \left(\frac{-9}{3}\right)\\=-\frac{3}{13}.\frac{3}{1}\\=-\frac{3.3}{13.1}\\=-\frac{9}{13}\)
2. \(\frac{12}{5} . \left(\frac{10}{-11}\right)\\=-\frac{12.10}{5.11}\\=-\frac{120}{55}\\=-\frac{24}{11}\)
3. \(\frac{2}{9} . \left(\frac{2}{-3}\right)\\=-\frac{2.2}{9.3}\\=-\frac{4}{27}\)
4. \(\frac{-8}{9} . \left(\frac{2}{-12}\right)\\=+\frac{8}{9}.\frac{1}{6}\\=+\frac{8.1}{9.6}\\=\frac{8}{54}\\=\frac{4}{27}\)
5. \(\frac{-9}{2} . \left(\frac{-2}{-11}\right)\\=-\frac{9.2}{2.11}\\=-\frac{18}{22}\\=-\frac{9}{11}\)
6. \(\frac{7}{15} . \frac{7}{4}\\=+\frac{7.7}{15.4}\\=\frac{49}{60}\)
7. \(\frac{10}{17} . \left(\frac{-3}{6}\right)\\=-\frac{10}{17}.\frac{1}{2}\\=-\frac{10.1}{17.2}\\=-\frac{10}{34}\\=-\frac{5}{17}\)
8. \(\frac{-8}{13} . \frac{6}{11}\\=-\frac{8.6}{13.11}\\=-\frac{48}{143}\)
9. \(\frac{5}{-8} . \left(\frac{5}{-8}\right)\\=+\frac{5.5}{8.8}\\=\frac{25}{64}\)
10. \(\frac{-12}{17} . \left(\frac{-10}{-9}\right)\\=-\frac{12.10}{17.9}\\=-\frac{120}{153}\\=-\frac{40}{51}\)
11. \(\frac{-6}{7} . \left(\frac{11}{-3}\right)\\=+\frac{6.11}{7.3}\\=\frac{66}{21}\\=\frac{22}{7}\)
12. \(\frac{-9}{-8} . \frac{4}{10}\\=+\frac{9}{8}.\frac{2}{5}\\=+\frac{9.2}{8.5}\\=\frac{18}{40}\\=\frac{9}{20}\)