Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{5}{7} . \left(\frac{-2}{-12}\right)\\=+\frac{5}{7}.\frac{1}{6}\\=+\frac{5.1}{7.6}\\=\frac{5}{42}\)
2. \(\frac{4}{11} . \left(\frac{-9}{-3}\right)\\=+\frac{4}{11}.\frac{3}{1}\\=+\frac{4.3}{11.1}\\=\frac{12}{11}\)
3. \(\frac{10}{3} . \left(\frac{-10}{3}\right)\\=-\frac{10.10}{3.3}\\=-\frac{100}{9}\)
4. \(\frac{7}{-2} . \left(\frac{-8}{-10}\right)\\=-\frac{7}{2}.\frac{4}{5}\\=-\frac{7.4}{2.5}\\=-\frac{28}{10}\\=-\frac{14}{5}\)
5. \(\frac{-7}{-5} . \left(\frac{-11}{10}\right)\\=-\frac{7.11}{5.10}\\=-\frac{77}{50}\)
6. \(\frac{-3}{10} . \left(\frac{-8}{-7}\right)\\=-\frac{3.8}{10.7}\\=-\frac{24}{70}\\=-\frac{12}{35}\)
7. \(\frac{-5}{7} . \left(\frac{-8}{12}\right)\\=+\frac{5}{7}.\frac{2}{3}\\=+\frac{5.2}{7.3}\\=\frac{10}{21}\)
8. \(\frac{3}{-7} . \left(\frac{-8}{9}\right)\\=+\frac{3.8}{7.9}\\=\frac{24}{63}\\=\frac{8}{21}\)
9. \(\frac{7}{-8} . \left(\frac{-3}{2}\right)\\=+\frac{7.3}{8.2}\\=\frac{21}{16}\)
10. \(\frac{8}{9} . \frac{11}{4}\\=+\frac{8.11}{9.4}\\=\frac{88}{36}\\=\frac{22}{9}\)
11. \(\frac{-8}{9} . \left(\frac{-8}{-10}\right)\\=-\frac{8}{9}.\frac{4}{5}\\=-\frac{8.4}{9.5}\\=-\frac{32}{45}\)
12. \(\frac{-5}{-11} . \left(\frac{-5}{-8}\right)\\=+\frac{5.5}{11.8}\\=\frac{25}{88}\)