Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{12}{19} . \frac{10}{6}\)
2. \(\frac{5}{17} . \frac{8}{9}\)
3. \(\frac{-5}{7} . \left(\frac{4}{-10}\right)\)
4. \(\frac{10}{-11} . \frac{10}{10}\)
5. \(\frac{2}{13} . \left(\frac{-2}{8}\right)\)
6. \(\frac{8}{-17} . \left(\frac{-5}{4}\right)\)
7. \(\frac{-12}{-11} . \left(\frac{8}{-9}\right)\)
8. \(\frac{2}{7} . \left(\frac{-8}{4}\right)\)
9. \(\frac{-11}{-5} . \left(\frac{-8}{-4}\right)\)
10. \(\frac{-6}{19} . \left(\frac{-7}{2}\right)\)
11. \(\frac{-8}{3} . \left(\frac{-4}{-6}\right)\)
12. \(\frac{3}{5} . \left(\frac{-10}{7}\right)\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{12}{19} . \frac{10}{6}\\=+\frac{12}{19}.\frac{5}{3}\\=+\frac{12.5}{19.3}\\=\frac{60}{57}\\=\frac{20}{19}\)
2. \(\frac{5}{17} . \frac{8}{9}\\=+\frac{5.8}{17.9}\\=\frac{40}{153}\)
3. \(\frac{-5}{7} . \left(\frac{4}{-10}\right)\\=+\frac{5}{7}.\frac{2}{5}\\=+\frac{5.2}{7.5}\\=\frac{10}{35}\\=\frac{2}{7}\)
4. \(\frac{10}{-11} . \frac{10}{10}\\=-\frac{10}{11}.\frac{1}{1}\\=-\frac{10.1}{11.1}\\=-\frac{10}{11}\)
5. \(\frac{2}{13} . \left(\frac{-2}{8}\right)\\=-\frac{2}{13}.\frac{1}{4}\\=-\frac{2.1}{13.4}\\=-\frac{2}{52}\\=-\frac{1}{26}\)
6. \(\frac{8}{-17} . \left(\frac{-5}{4}\right)\\=+\frac{8.5}{17.4}\\=\frac{40}{68}\\=\frac{10}{17}\)
7. \(\frac{-12}{-11} . \left(\frac{8}{-9}\right)\\=-\frac{12.8}{11.9}\\=-\frac{96}{99}\\=-\frac{32}{33}\)
8. \(\frac{2}{7} . \left(\frac{-8}{4}\right)\\=-\frac{2}{7}.\frac{2}{1}\\=-\frac{2.2}{7.1}\\=-\frac{4}{7}\)
9. \(\frac{-11}{-5} . \left(\frac{-8}{-4}\right)\\=+\frac{11}{5}.\frac{2}{1}\\=+\frac{11.2}{5.1}\\=\frac{22}{5}\)
10. \(\frac{-6}{19} . \left(\frac{-7}{2}\right)\\=+\frac{6.7}{19.2}\\=\frac{42}{38}\\=\frac{21}{19}\)
11. \(\frac{-8}{3} . \left(\frac{-4}{-6}\right)\\=-\frac{8}{3}.\frac{2}{3}\\=-\frac{8.2}{3.3}\\=-\frac{16}{9}\)
12. \(\frac{3}{5} . \left(\frac{-10}{7}\right)\\=-\frac{3.10}{5.7}\\=-\frac{30}{35}\\=-\frac{6}{7}\)