Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{-3}{-10} . \frac{6}{5}\)
2. \(\frac{6}{-17} . \left(\frac{-12}{-4}\right)\)
3. \(\frac{10}{13} . \left(\frac{-10}{-12}\right)\)
4. \(\frac{5}{3} . \left(\frac{-7}{4}\right)\)
5. \(\frac{5}{-13} . \left(\frac{-4}{2}\right)\)
6. \(\frac{-9}{-7} . \left(\frac{-12}{-7}\right)\)
7. \(\frac{-5}{16} . \frac{6}{7}\)
8. \(\frac{-3}{2} . \left(\frac{5}{-11}\right)\)
9. \(\frac{-11}{-8} . \frac{4}{10}\)
10. \(\frac{-5}{13} . \left(\frac{-7}{3}\right)\)
11. \(\frac{-11}{-8} . \frac{5}{4}\)
12. \(\frac{2}{13} . \frac{7}{2}\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-3}{-10} . \frac{6}{5}\\=+\frac{3.6}{10.5}\\=\frac{18}{50}\\=\frac{9}{25}\)
2. \(\frac{6}{-17} . \left(\frac{-12}{-4}\right)\\=-\frac{6}{17}.\frac{3}{1}\\=-\frac{6.3}{17.1}\\=-\frac{18}{17}\)
3. \(\frac{10}{13} . \left(\frac{-10}{-12}\right)\\=+\frac{10}{13}.\frac{5}{6}\\=+\frac{10.5}{13.6}\\=\frac{50}{78}\\=\frac{25}{39}\)
4. \(\frac{5}{3} . \left(\frac{-7}{4}\right)\\=-\frac{5.7}{3.4}\\=-\frac{35}{12}\)
5. \(\frac{5}{-13} . \left(\frac{-4}{2}\right)\\=+\frac{5}{13}.\frac{2}{1}\\=+\frac{5.2}{13.1}\\=\frac{10}{13}\)
6. \(\frac{-9}{-7} . \left(\frac{-12}{-7}\right)\\=+\frac{9.12}{7.7}\\=\frac{108}{49}\)
7. \(\frac{-5}{16} . \frac{6}{7}\\=-\frac{5.6}{16.7}\\=-\frac{30}{112}\\=-\frac{15}{56}\)
8. \(\frac{-3}{2} . \left(\frac{5}{-11}\right)\\=+\frac{3.5}{2.11}\\=\frac{15}{22}\)
9. \(\frac{-11}{-8} . \frac{4}{10}\\=+\frac{11}{8}.\frac{2}{5}\\=+\frac{11.2}{8.5}\\=\frac{22}{40}\\=\frac{11}{20}\)
10. \(\frac{-5}{13} . \left(\frac{-7}{3}\right)\\=+\frac{5.7}{13.3}\\=\frac{35}{39}\)
11. \(\frac{-11}{-8} . \frac{5}{4}\\=+\frac{11.5}{8.4}\\=\frac{55}{32}\)
12. \(\frac{2}{13} . \frac{7}{2}\\=+\frac{2.7}{13.2}\\=\frac{14}{26}\\=\frac{7}{13}\)