Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{10}{13} . \left(\frac{5}{-10}\right)\)
2. \(\frac{-5}{9} . \left(\frac{5}{-6}\right)\)
3. \(\frac{7}{5} . \left(\frac{-8}{4}\right)\)
4. \(\frac{10}{11} . \left(\frac{-5}{-3}\right)\)
5. \(\frac{-9}{-14} . \left(\frac{-11}{-10}\right)\)
6. \(\frac{6}{7} . \frac{3}{5}\)
7. \(\frac{7}{-2} . \frac{3}{4}\)
8. \(\frac{-7}{8} . \left(\frac{-6}{-11}\right)\)
9. \(\frac{-11}{19} . \frac{5}{5}\)
10. \(\frac{6}{-11} . \left(\frac{-7}{7}\right)\)
11. \(\frac{4}{7} . \left(\frac{-9}{2}\right)\)
12. \(\frac{-5}{-18} . \left(\frac{2}{-10}\right)\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{10}{13} . \left(\frac{5}{-10}\right)\\=-\frac{10}{13}.\frac{1}{2}\\=-\frac{10.1}{13.2}\\=-\frac{10}{26}\\=-\frac{5}{13}\)
2. \(\frac{-5}{9} . \left(\frac{5}{-6}\right)\\=+\frac{5.5}{9.6}\\=\frac{25}{54}\)
3. \(\frac{7}{5} . \left(\frac{-8}{4}\right)\\=-\frac{7}{5}.\frac{2}{1}\\=-\frac{7.2}{5.1}\\=-\frac{14}{5}\)
4. \(\frac{10}{11} . \left(\frac{-5}{-3}\right)\\=+\frac{10.5}{11.3}\\=\frac{50}{33}\)
5. \(\frac{-9}{-14} . \left(\frac{-11}{-10}\right)\\=+\frac{9.11}{14.10}\\=\frac{99}{140}\)
6. \(\frac{6}{7} . \frac{3}{5}\\=+\frac{6.3}{7.5}\\=\frac{18}{35}\)
7. \(\frac{7}{-2} . \frac{3}{4}\\=-\frac{7.3}{2.4}\\=-\frac{21}{8}\)
8. \(\frac{-7}{8} . \left(\frac{-6}{-11}\right)\\=-\frac{7.6}{8.11}\\=-\frac{42}{88}\\=-\frac{21}{44}\)
9. \(\frac{-11}{19} . \frac{5}{5}\\=-\frac{11}{19}.\frac{1}{1}\\=-\frac{11.1}{19.1}\\=-\frac{11}{19}\)
10. \(\frac{6}{-11} . \left(\frac{-7}{7}\right)\\=+\frac{6}{11}.\frac{1}{1}\\=+\frac{6.1}{11.1}\\=\frac{6}{11}\)
11. \(\frac{4}{7} . \left(\frac{-9}{2}\right)\\=-\frac{4.9}{7.2}\\=-\frac{36}{14}\\=-\frac{18}{7}\)
12. \(\frac{-5}{-18} . \left(\frac{2}{-10}\right)\\=-\frac{5}{18}.\frac{1}{5}\\=-\frac{5.1}{18.5}\\=-\frac{5}{90}\\=-\frac{1}{18}\)