Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{-4}{7} . \left(\frac{3}{-3}\right)\)
2. \(\frac{-2}{19} . \left(\frac{-9}{-11}\right)\)
3. \(\frac{5}{18} . \left(\frac{-5}{12}\right)\)
4. \(\frac{4}{-9} . \frac{9}{7}\)
5. \(\frac{-2}{-7} . \left(\frac{-7}{4}\right)\)
6. \(\frac{5}{19} . \left(\frac{12}{-9}\right)\)
7. \(\frac{8}{-17} . \left(\frac{-7}{-5}\right)\)
8. \(\frac{-3}{-10} . \left(\frac{5}{-9}\right)\)
9. \(\frac{-7}{-11} . \left(\frac{12}{-9}\right)\)
10. \(\frac{-2}{19} . \left(\frac{-11}{9}\right)\)
11. \(\frac{11}{10} . \left(\frac{6}{-5}\right)\)
12. \(\frac{12}{-19} . \left(\frac{-9}{8}\right)\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-4}{7} . \left(\frac{3}{-3}\right)\\=+\frac{4}{7}.\frac{1}{1}\\=+\frac{4.1}{7.1}\\=\frac{4}{7}\)
2. \(\frac{-2}{19} . \left(\frac{-9}{-11}\right)\\=-\frac{2.9}{19.11}\\=-\frac{18}{209}\)
3. \(\frac{5}{18} . \left(\frac{-5}{12}\right)\\=-\frac{5.5}{18.12}\\=-\frac{25}{216}\)
4. \(\frac{4}{-9} . \frac{9}{7}\\=-\frac{4.9}{9.7}\\=-\frac{36}{63}\\=-\frac{4}{7}\)
5. \(\frac{-2}{-7} . \left(\frac{-7}{4}\right)\\=-\frac{2.7}{7.4}\\=-\frac{14}{28}\\=-\frac{1}{2}\)
6. \(\frac{5}{19} . \left(\frac{12}{-9}\right)\\=-\frac{5}{19}.\frac{4}{3}\\=-\frac{5.4}{19.3}\\=-\frac{20}{57}\)
7. \(\frac{8}{-17} . \left(\frac{-7}{-5}\right)\\=-\frac{8.7}{17.5}\\=-\frac{56}{85}\)
8. \(\frac{-3}{-10} . \left(\frac{5}{-9}\right)\\=-\frac{3.5}{10.9}\\=-\frac{15}{90}\\=-\frac{1}{6}\)
9. \(\frac{-7}{-11} . \left(\frac{12}{-9}\right)\\=-\frac{7}{11}.\frac{4}{3}\\=-\frac{7.4}{11.3}\\=-\frac{28}{33}\)
10. \(\frac{-2}{19} . \left(\frac{-11}{9}\right)\\=+\frac{2.11}{19.9}\\=\frac{22}{171}\)
11. \(\frac{11}{10} . \left(\frac{6}{-5}\right)\\=-\frac{11.6}{10.5}\\=-\frac{66}{50}\\=-\frac{33}{25}\)
12. \(\frac{12}{-19} . \left(\frac{-9}{8}\right)\\=+\frac{12.9}{19.8}\\=\frac{108}{152}\\=\frac{27}{38}\)