Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{9}{4} . \left(\frac{-2}{-5}\right)\)
2. \(\frac{4}{-11} . \frac{7}{7}\)
3. \(\frac{-2}{15} . \frac{5}{7}\)
4. \(\frac{3}{-11} . \left(\frac{-7}{4}\right)\)
5. \(\frac{-2}{-15} . \left(\frac{-3}{-12}\right)\)
6. \(\frac{-8}{-11} . \frac{2}{10}\)
7. \(\frac{2}{15} . \left(\frac{-9}{2}\right)\)
8. \(\frac{4}{-7} . \frac{4}{10}\)
9. \(\frac{5}{11} . \left(\frac{2}{-12}\right)\)
10. \(\frac{-11}{-12} . \left(\frac{-9}{2}\right)\)
11. \(\frac{12}{19} . \frac{9}{5}\)
12. \(\frac{-9}{14} . \left(\frac{9}{-9}\right)\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{9}{4} . \left(\frac{-2}{-5}\right)\\=+\frac{9.2}{4.5}\\=\frac{18}{20}\\=\frac{9}{10}\)
2. \(\frac{4}{-11} . \frac{7}{7}\\=-\frac{4}{11}.\frac{1}{1}\\=-\frac{4.1}{11.1}\\=-\frac{4}{11}\)
3. \(\frac{-2}{15} . \frac{5}{7}\\=-\frac{2.5}{15.7}\\=-\frac{10}{105}\\=-\frac{2}{21}\)
4. \(\frac{3}{-11} . \left(\frac{-7}{4}\right)\\=+\frac{3.7}{11.4}\\=\frac{21}{44}\)
5. \(\frac{-2}{-15} . \left(\frac{-3}{-12}\right)\\=+\frac{2}{15}.\frac{1}{4}\\=+\frac{2.1}{15.4}\\=\frac{2}{60}\\=\frac{1}{30}\)
6. \(\frac{-8}{-11} . \frac{2}{10}\\=+\frac{8}{11}.\frac{1}{5}\\=+\frac{8.1}{11.5}\\=\frac{8}{55}\)
7. \(\frac{2}{15} . \left(\frac{-9}{2}\right)\\=-\frac{2.9}{15.2}\\=-\frac{18}{30}\\=-\frac{3}{5}\)
8. \(\frac{4}{-7} . \frac{4}{10}\\=-\frac{4}{7}.\frac{2}{5}\\=-\frac{4.2}{7.5}\\=-\frac{8}{35}\)
9. \(\frac{5}{11} . \left(\frac{2}{-12}\right)\\=-\frac{5}{11}.\frac{1}{6}\\=-\frac{5.1}{11.6}\\=-\frac{5}{66}\)
10. \(\frac{-11}{-12} . \left(\frac{-9}{2}\right)\\=-\frac{11.9}{12.2}\\=-\frac{99}{24}\\=-\frac{33}{8}\)
11. \(\frac{12}{19} . \frac{9}{5}\\=+\frac{12.9}{19.5}\\=\frac{108}{95}\)
12. \(\frac{-9}{14} . \left(\frac{9}{-9}\right)\\=+\frac{9}{14}.\frac{1}{1}\\=+\frac{9.1}{14.1}\\=\frac{9}{14}\)