Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-3}{10} . \left(\frac{-6}{-5}\right)\\=-\frac{3.6}{10.5}\\=-\frac{18}{50}\\=-\frac{9}{25}\)
2. \(\frac{11}{19} . \left(\frac{6}{-10}\right)\\=-\frac{11}{19}.\frac{3}{5}\\=-\frac{11.3}{19.5}\\=-\frac{33}{95}\)
3. \(\frac{-8}{17} . \left(\frac{5}{-5}\right)\\=+\frac{8}{17}.\frac{1}{1}\\=+\frac{8.1}{17.1}\\=\frac{8}{17}\)
4. \(\frac{12}{19} . \frac{3}{8}\\=+\frac{12.3}{19.8}\\=\frac{36}{152}\\=\frac{9}{38}\)
5. \(\frac{9}{7} . \left(\frac{-11}{8}\right)\\=-\frac{9.11}{7.8}\\=-\frac{99}{56}\)
6. \(\frac{2}{7} . \left(\frac{-7}{5}\right)\\=-\frac{2.7}{7.5}\\=-\frac{14}{35}\\=-\frac{2}{5}\)
7. \(\frac{5}{2} . \frac{7}{12}\\=+\frac{5.7}{2.12}\\=\frac{35}{24}\)
8. \(\frac{10}{7} . \left(\frac{-3}{-9}\right)\\=+\frac{10}{7}.\frac{1}{3}\\=+\frac{10.1}{7.3}\\=\frac{10}{21}\)
9. \(\frac{-3}{19} . \left(\frac{-3}{-6}\right)\\=-\frac{3}{19}.\frac{1}{2}\\=-\frac{3.1}{19.2}\\=-\frac{3}{38}\)
10. \(\frac{-3}{13} . \left(\frac{7}{-3}\right)\\=+\frac{3.7}{13.3}\\=\frac{21}{39}\\=\frac{7}{13}\)
11. \(\frac{10}{-3} . \left(\frac{8}{-10}\right)\\=+\frac{10}{3}.\frac{4}{5}\\=+\frac{10.4}{3.5}\\=\frac{40}{15}\\=\frac{8}{3}\)
12. \(\frac{-7}{-17} . \left(\frac{-5}{-11}\right)\\=+\frac{7.5}{17.11}\\=\frac{35}{187}\)