Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{-3}{-10} . \left(\frac{-6}{-11}\right)\)
2. \(\frac{2}{5} . \frac{11}{3}\)
3. \(\frac{12}{-7} . \left(\frac{-10}{2}\right)\)
4. \(\frac{4}{17} . \left(\frac{-10}{4}\right)\)
5. \(\frac{3}{14} . \frac{8}{7}\)
6. \(\frac{5}{-7} . \left(\frac{-6}{-10}\right)\)
7. \(\frac{2}{15} . \frac{9}{9}\)
8. \(\frac{9}{-19} . \frac{11}{6}\)
9. \(\frac{-9}{-14} . \left(\frac{-5}{6}\right)\)
10. \(\frac{-4}{-13} . \left(\frac{5}{-8}\right)\)
11. \(\frac{9}{7} . \left(\frac{-10}{11}\right)\)
12. \(\frac{-11}{-10} . \left(\frac{-7}{4}\right)\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-3}{-10} . \left(\frac{-6}{-11}\right)\\=+\frac{3.6}{10.11}\\=\frac{18}{110}\\=\frac{9}{55}\)
2. \(\frac{2}{5} . \frac{11}{3}\\=+\frac{2.11}{5.3}\\=\frac{22}{15}\)
3. \(\frac{12}{-7} . \left(\frac{-10}{2}\right)\\=+\frac{12}{7}.\frac{5}{1}\\=+\frac{12.5}{7.1}\\=\frac{60}{7}\)
4. \(\frac{4}{17} . \left(\frac{-10}{4}\right)\\=-\frac{4}{17}.\frac{5}{2}\\=-\frac{4.5}{17.2}\\=-\frac{20}{34}\\=-\frac{10}{17}\)
5. \(\frac{3}{14} . \frac{8}{7}\\=+\frac{3.8}{14.7}\\=\frac{24}{98}\\=\frac{12}{49}\)
6. \(\frac{5}{-7} . \left(\frac{-6}{-10}\right)\\=-\frac{5}{7}.\frac{3}{5}\\=-\frac{5.3}{7.5}\\=-\frac{15}{35}\\=-\frac{3}{7}\)
7. \(\frac{2}{15} . \frac{9}{9}\\=+\frac{2}{15}.\frac{1}{1}\\=+\frac{2.1}{15.1}\\=\frac{2}{15}\)
8. \(\frac{9}{-19} . \frac{11}{6}\\=-\frac{9.11}{19.6}\\=-\frac{99}{114}\\=-\frac{33}{38}\)
9. \(\frac{-9}{-14} . \left(\frac{-5}{6}\right)\\=-\frac{9.5}{14.6}\\=-\frac{45}{84}\\=-\frac{15}{28}\)
10. \(\frac{-4}{-13} . \left(\frac{5}{-8}\right)\\=-\frac{4.5}{13.8}\\=-\frac{20}{104}\\=-\frac{5}{26}\)
11. \(\frac{9}{7} . \left(\frac{-10}{11}\right)\\=-\frac{9.10}{7.11}\\=-\frac{90}{77}\)
12. \(\frac{-11}{-10} . \left(\frac{-7}{4}\right)\\=-\frac{11.7}{10.4}\\=-\frac{77}{40}\)