Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{4}{-9} . \frac{12}{12}\\=-\frac{4}{9}.\frac{1}{1}\\=-\frac{4.1}{9.1}\\=-\frac{4}{9}\)
2. \(\frac{2}{11} . \left(\frac{-5}{-2}\right)\\=+\frac{2.5}{11.2}\\=\frac{10}{22}\\=\frac{5}{11}\)
3. \(\frac{9}{-2} . \left(\frac{-10}{7}\right)\\=+\frac{9.10}{2.7}\\=\frac{90}{14}\\=\frac{45}{7}\)
4. \(\frac{6}{-11} . \left(\frac{2}{-6}\right)\\=+\frac{6}{11}.\frac{1}{3}\\=+\frac{6.1}{11.3}\\=\frac{6}{33}\\=\frac{2}{11}\)
5. \(\frac{11}{-7} . \frac{7}{10}\\=-\frac{11.7}{7.10}\\=-\frac{77}{70}\\=-\frac{11}{10}\)
6. \(\frac{-10}{-7} . \left(\frac{-9}{3}\right)\\=-\frac{10}{7}.\frac{3}{1}\\=-\frac{10.3}{7.1}\\=-\frac{30}{7}\)
7. \(\frac{-3}{2} . \left(\frac{-3}{-7}\right)\\=-\frac{3.3}{2.7}\\=-\frac{9}{14}\)
8. \(\frac{-11}{18} . \left(\frac{-2}{3}\right)\\=+\frac{11.2}{18.3}\\=\frac{22}{54}\\=\frac{11}{27}\)
9. \(\frac{4}{11} . \left(\frac{-6}{-12}\right)\\=+\frac{4}{11}.\frac{1}{2}\\=+\frac{4.1}{11.2}\\=\frac{4}{22}\\=\frac{2}{11}\)
10. \(\frac{-3}{2} . \frac{6}{12}\\=-\frac{3}{2}.\frac{1}{2}\\=-\frac{3.1}{2.2}\\=-\frac{3}{4}\)
11. \(\frac{-6}{7} . \left(\frac{6}{-8}\right)\\=+\frac{6}{7}.\frac{3}{4}\\=+\frac{6.3}{7.4}\\=\frac{18}{28}\\=\frac{9}{14}\)
12. \(\frac{-5}{-11} . \frac{2}{3}\\=+\frac{5.2}{11.3}\\=\frac{10}{33}\)