Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-11}{-7} . \left(\frac{5}{-5}\right)\\=-\frac{11}{7}.\frac{1}{1}\\=-\frac{11.1}{7.1}\\=-\frac{11}{7}\)
2. \(\frac{3}{7} . \frac{5}{12}\\=+\frac{3.5}{7.12}\\=\frac{15}{84}\\=\frac{5}{28}\)
3. \(\frac{-7}{-3} . \left(\frac{-12}{9}\right)\\=-\frac{7}{3}.\frac{4}{3}\\=-\frac{7.4}{3.3}\\=-\frac{28}{9}\)
4. \(\frac{8}{-13} . \left(\frac{-3}{-11}\right)\\=-\frac{8.3}{13.11}\\=-\frac{24}{143}\)
5. \(\frac{2}{7} . \left(\frac{-4}{-2}\right)\\=+\frac{2}{7}.\frac{2}{1}\\=+\frac{2.2}{7.1}\\=\frac{4}{7}\)
6. \(\frac{-3}{16} . \left(\frac{-2}{-6}\right)\\=-\frac{3}{16}.\frac{1}{3}\\=-\frac{3.1}{16.3}\\=-\frac{3}{48}\\=-\frac{1}{16}\)
7. \(\frac{10}{7} . \left(\frac{-8}{2}\right)\\=-\frac{10}{7}.\frac{4}{1}\\=-\frac{10.4}{7.1}\\=-\frac{40}{7}\)
8. \(\frac{7}{-2} . \frac{12}{4}\\=-\frac{7}{2}.\frac{3}{1}\\=-\frac{7.3}{2.1}\\=-\frac{21}{2}\)
9. \(\frac{-7}{8} . \left(\frac{-7}{11}\right)\\=+\frac{7.7}{8.11}\\=\frac{49}{88}\)
10. \(\frac{4}{-17} . \frac{5}{10}\\=-\frac{4}{17}.\frac{1}{2}\\=-\frac{4.1}{17.2}\\=-\frac{4}{34}\\=-\frac{2}{17}\)
11. \(\frac{9}{10} . \left(\frac{-11}{8}\right)\\=-\frac{9.11}{10.8}\\=-\frac{99}{80}\)
12. \(\frac{2}{-17} . \left(\frac{-9}{7}\right)\\=+\frac{2.9}{17.7}\\=\frac{18}{119}\)