Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-10}{-9} . \left(\frac{-9}{11}\right)\\=-\frac{10.9}{9.11}\\=-\frac{90}{99}\\=-\frac{10}{11}\)
2. \(\frac{-2}{-13} . \frac{7}{11}\\=+\frac{2.7}{13.11}\\=\frac{14}{143}\)
3. \(\frac{12}{5} . \left(\frac{-5}{7}\right)\\=-\frac{12.5}{5.7}\\=-\frac{60}{35}\\=-\frac{12}{7}\)
4. \(\frac{-12}{-5} . \frac{11}{3}\\=+\frac{12.11}{5.3}\\=\frac{132}{15}\\=\frac{44}{5}\)
5. \(\frac{8}{9} . \left(\frac{-5}{12}\right)\\=-\frac{8.5}{9.12}\\=-\frac{40}{108}\\=-\frac{10}{27}\)
6. \(\frac{-11}{-2} . \left(\frac{-3}{10}\right)\\=-\frac{11.3}{2.10}\\=-\frac{33}{20}\)
7. \(\frac{-8}{15} . \left(\frac{-11}{11}\right)\\=+\frac{8}{15}.\frac{1}{1}\\=+\frac{8.1}{15.1}\\=\frac{8}{15}\)
8. \(\frac{-12}{-5} . \frac{3}{5}\\=+\frac{12.3}{5.5}\\=\frac{36}{25}\)
9. \(\frac{8}{-3} . \frac{5}{10}\\=-\frac{8}{3}.\frac{1}{2}\\=-\frac{8.1}{3.2}\\=-\frac{8}{6}\\=-\frac{4}{3}\)
10. \(\frac{-7}{2} . \left(\frac{-8}{-7}\right)\\=-\frac{7.8}{2.7}\\=-\frac{56}{14}\\=-\frac{4}{1}= 4\)
11. \(\frac{-8}{-17} . \left(\frac{9}{-7}\right)\\=-\frac{8.9}{17.7}\\=-\frac{72}{119}\)
12. \(\frac{-12}{7} . \left(\frac{-12}{11}\right)\\=+\frac{12.12}{7.11}\\=\frac{144}{77}\)