Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-9}{-8} . \left(\frac{-12}{-4}\right)\\=+\frac{9}{8}.\frac{3}{1}\\=+\frac{9.3}{8.1}\\=\frac{27}{8}\)
2. \(\frac{11}{17} . \frac{10}{10}\\=+\frac{11}{17}.\frac{1}{1}\\=+\frac{11.1}{17.1}\\=\frac{11}{17}\)
3. \(\frac{4}{-13} . \left(\frac{-11}{9}\right)\\=+\frac{4.11}{13.9}\\=\frac{44}{117}\)
4. \(\frac{-5}{-16} . \left(\frac{9}{-5}\right)\\=-\frac{5.9}{16.5}\\=-\frac{45}{80}\\=-\frac{9}{16}\)
5. \(\frac{9}{-16} . \frac{9}{3}\\=-\frac{9}{16}.\frac{3}{1}\\=-\frac{9.3}{16.1}\\=-\frac{27}{16}\)
6. \(\frac{3}{-10} . \frac{2}{11}\\=-\frac{3.2}{10.11}\\=-\frac{6}{110}\\=-\frac{3}{55}\)
7. \(\frac{7}{-13} . \left(\frac{11}{-12}\right)\\=+\frac{7.11}{13.12}\\=\frac{77}{156}\)
8. \(\frac{4}{5} . \left(\frac{9}{-6}\right)\\=-\frac{4}{5}.\frac{3}{2}\\=-\frac{4.3}{5.2}\\=-\frac{12}{10}\\=-\frac{6}{5}\)
9. \(\frac{5}{2} . \left(\frac{-4}{-7}\right)\\=+\frac{5.4}{2.7}\\=\frac{20}{14}\\=\frac{10}{7}\)
10. \(\frac{-6}{11} . \left(\frac{-3}{-12}\right)\\=-\frac{6}{11}.\frac{1}{4}\\=-\frac{6.1}{11.4}\\=-\frac{6}{44}\\=-\frac{3}{22}\)
11. \(\frac{12}{-11} . \frac{9}{12}\\=-\frac{12}{11}.\frac{3}{4}\\=-\frac{12.3}{11.4}\\=-\frac{36}{44}\\=-\frac{9}{11}\)
12. \(\frac{-6}{7} . \left(\frac{-3}{-2}\right)\\=-\frac{6.3}{7.2}\\=-\frac{18}{14}\\=-\frac{9}{7}\)