Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{11}{-18} . \frac{5}{9}\)
2. \(\frac{3}{-7} . \left(\frac{-11}{10}\right)\)
3. \(\frac{5}{-16} . \left(\frac{-10}{-4}\right)\)
4. \(\frac{-5}{2} . \frac{7}{2}\)
5. \(\frac{-11}{5} . \left(\frac{-6}{2}\right)\)
6. \(\frac{-8}{11} . \left(\frac{-12}{-5}\right)\)
7. \(\frac{10}{19} . \left(\frac{-10}{-7}\right)\)
8. \(\frac{-5}{-8} . \left(\frac{-4}{5}\right)\)
9. \(\frac{5}{-2} . \left(\frac{-3}{12}\right)\)
10. \(\frac{-2}{13} . \left(\frac{10}{-11}\right)\)
11. \(\frac{-2}{17} . \frac{10}{9}\)
12. \(\frac{-6}{13} . \left(\frac{-4}{6}\right)\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{11}{-18} . \frac{5}{9}\\=-\frac{11.5}{18.9}\\=-\frac{55}{162}\)
2. \(\frac{3}{-7} . \left(\frac{-11}{10}\right)\\=+\frac{3.11}{7.10}\\=\frac{33}{70}\)
3. \(\frac{5}{-16} . \left(\frac{-10}{-4}\right)\\=-\frac{5}{16}.\frac{5}{2}\\=-\frac{5.5}{16.2}\\=-\frac{25}{32}\)
4. \(\frac{-5}{2} . \frac{7}{2}\\=-\frac{5.7}{2.2}\\=-\frac{35}{4}\)
5. \(\frac{-11}{5} . \left(\frac{-6}{2}\right)\\=+\frac{11}{5}.\frac{3}{1}\\=+\frac{11.3}{5.1}\\=\frac{33}{5}\)
6. \(\frac{-8}{11} . \left(\frac{-12}{-5}\right)\\=-\frac{8.12}{11.5}\\=-\frac{96}{55}\)
7. \(\frac{10}{19} . \left(\frac{-10}{-7}\right)\\=+\frac{10.10}{19.7}\\=\frac{100}{133}\)
8. \(\frac{-5}{-8} . \left(\frac{-4}{5}\right)\\=-\frac{5.4}{8.5}\\=-\frac{20}{40}\\=-\frac{1}{2}\)
9. \(\frac{5}{-2} . \left(\frac{-3}{12}\right)\\=+\frac{5}{2}.\frac{1}{4}\\=+\frac{5.1}{2.4}\\=\frac{5}{8}\)
10. \(\frac{-2}{13} . \left(\frac{10}{-11}\right)\\=+\frac{2.10}{13.11}\\=\frac{20}{143}\)
11. \(\frac{-2}{17} . \frac{10}{9}\\=-\frac{2.10}{17.9}\\=-\frac{20}{153}\)
12. \(\frac{-6}{13} . \left(\frac{-4}{6}\right)\\=+\frac{6}{13}.\frac{2}{3}\\=+\frac{6.2}{13.3}\\=\frac{12}{39}\\=\frac{4}{13}\)