Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{-3}{-10} . \frac{8}{5}\)
2. \(\frac{-12}{11} . \left(\frac{-6}{-5}\right)\)
3. \(\frac{8}{11} . \left(\frac{-6}{-12}\right)\)
4. \(\frac{-6}{11} . \left(\frac{-8}{3}\right)\)
5. \(\frac{10}{-3} . \left(\frac{-3}{5}\right)\)
6. \(\frac{4}{9} . \left(\frac{12}{-8}\right)\)
7. \(\frac{-7}{-4} . \left(\frac{-12}{8}\right)\)
8. \(\frac{9}{13} . \left(\frac{-4}{7}\right)\)
9. \(\frac{7}{18} . \left(\frac{-10}{10}\right)\)
10. \(\frac{4}{5} . \frac{6}{12}\)
11. \(\frac{9}{-7} . \left(\frac{8}{-6}\right)\)
12. \(\frac{11}{12} . \left(\frac{-3}{5}\right)\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-3}{-10} . \frac{8}{5}\\=+\frac{3.8}{10.5}\\=\frac{24}{50}\\=\frac{12}{25}\)
2. \(\frac{-12}{11} . \left(\frac{-6}{-5}\right)\\=-\frac{12.6}{11.5}\\=-\frac{72}{55}\)
3. \(\frac{8}{11} . \left(\frac{-6}{-12}\right)\\=+\frac{8}{11}.\frac{1}{2}\\=+\frac{8.1}{11.2}\\=\frac{8}{22}\\=\frac{4}{11}\)
4. \(\frac{-6}{11} . \left(\frac{-8}{3}\right)\\=+\frac{6.8}{11.3}\\=\frac{48}{33}\\=\frac{16}{11}\)
5. \(\frac{10}{-3} . \left(\frac{-3}{5}\right)\\=+\frac{10.3}{3.5}\\=\frac{30}{15}\\=\frac{2}{1}= 2\)
6. \(\frac{4}{9} . \left(\frac{12}{-8}\right)\\=-\frac{4}{9}.\frac{3}{2}\\=-\frac{4.3}{9.2}\\=-\frac{12}{18}\\=-\frac{2}{3}\)
7. \(\frac{-7}{-4} . \left(\frac{-12}{8}\right)\\=-\frac{7}{4}.\frac{3}{2}\\=-\frac{7.3}{4.2}\\=-\frac{21}{8}\)
8. \(\frac{9}{13} . \left(\frac{-4}{7}\right)\\=-\frac{9.4}{13.7}\\=-\frac{36}{91}\)
9. \(\frac{7}{18} . \left(\frac{-10}{10}\right)\\=-\frac{7}{18}.\frac{1}{1}\\=-\frac{7.1}{18.1}\\=-\frac{7}{18}\)
10. \(\frac{4}{5} . \frac{6}{12}\\=+\frac{4}{5}.\frac{1}{2}\\=+\frac{4.1}{5.2}\\=\frac{4}{10}\\=\frac{2}{5}\)
11. \(\frac{9}{-7} . \left(\frac{8}{-6}\right)\\=+\frac{9}{7}.\frac{4}{3}\\=+\frac{9.4}{7.3}\\=\frac{36}{21}\\=\frac{12}{7}\)
12. \(\frac{11}{12} . \left(\frac{-3}{5}\right)\\=-\frac{11.3}{12.5}\\=-\frac{33}{60}\\=-\frac{11}{20}\)