Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{4}{13} . \left(\frac{-2}{9}\right)\\=-\frac{4.2}{13.9}\\=-\frac{8}{117}\)
2. \(\frac{-9}{-11} . \left(\frac{2}{-7}\right)\\=-\frac{9.2}{11.7}\\=-\frac{18}{77}\)
3. \(\frac{4}{13} . \left(\frac{9}{-7}\right)\\=-\frac{4.9}{13.7}\\=-\frac{36}{91}\)
4. \(\frac{-5}{-9} . \frac{3}{7}\\=+\frac{5.3}{9.7}\\=\frac{15}{63}\\=\frac{5}{21}\)
5. \(\frac{11}{13} . \left(\frac{-9}{-9}\right)\\=+\frac{11}{13}.\frac{1}{1}\\=+\frac{11.1}{13.1}\\=\frac{11}{13}\)
6. \(\frac{-3}{10} . \frac{5}{12}\\=-\frac{3.5}{10.12}\\=-\frac{15}{120}\\=-\frac{1}{8}\)
7. \(\frac{-9}{2} . \left(\frac{-8}{4}\right)\\=+\frac{9}{2}.\frac{2}{1}\\=+\frac{9.2}{2.1}\\=\frac{18}{2}\\=\frac{9}{1}= 9\)
8. \(\frac{-8}{-15} . \left(\frac{10}{-12}\right)\\=-\frac{8}{15}.\frac{5}{6}\\=-\frac{8.5}{15.6}\\=-\frac{40}{90}\\=-\frac{4}{9}\)
9. \(\frac{-11}{-5} . \left(\frac{7}{-11}\right)\\=-\frac{11.7}{5.11}\\=-\frac{77}{55}\\=-\frac{7}{5}\)
10. \(\frac{-4}{11} . \frac{8}{5}\\=-\frac{4.8}{11.5}\\=-\frac{32}{55}\)
11. \(\frac{-3}{-7} . \left(\frac{-4}{-2}\right)\\=+\frac{3}{7}.\frac{2}{1}\\=+\frac{3.2}{7.1}\\=\frac{6}{7}\)
12. \(\frac{5}{8} . \frac{3}{11}\\=+\frac{5.3}{8.11}\\=\frac{15}{88}\)