Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-4}{-15} . \frac{9}{8}\\=+\frac{4.9}{15.8}\\=\frac{36}{120}\\=\frac{3}{10}\)
2. \(\frac{-11}{-6} . \frac{7}{7}\\=+\frac{11}{6}.\frac{1}{1}\\=+\frac{11.1}{6.1}\\=\frac{11}{6}\)
3. \(\frac{-6}{11} . \frac{9}{11}\\=-\frac{6.9}{11.11}\\=-\frac{54}{121}\)
4. \(\frac{4}{-9} . \left(\frac{-5}{2}\right)\\=+\frac{4.5}{9.2}\\=\frac{20}{18}\\=\frac{10}{9}\)
5. \(\frac{-4}{7} . \left(\frac{-5}{-4}\right)\\=-\frac{4.5}{7.4}\\=-\frac{20}{28}\\=-\frac{5}{7}\)
6. \(\frac{-4}{-5} . \left(\frac{-2}{-12}\right)\\=+\frac{4}{5}.\frac{1}{6}\\=+\frac{4.1}{5.6}\\=\frac{4}{30}\\=\frac{2}{15}\)
7. \(\frac{10}{-9} . \left(\frac{-12}{8}\right)\\=+\frac{10}{9}.\frac{3}{2}\\=+\frac{10.3}{9.2}\\=\frac{30}{18}\\=\frac{5}{3}\)
8. \(\frac{5}{17} . \left(\frac{2}{-2}\right)\\=-\frac{5}{17}.\frac{1}{1}\\=-\frac{5.1}{17.1}\\=-\frac{5}{17}\)
9. \(\frac{7}{4} . \frac{12}{3}\\=+\frac{7}{4}.\frac{4}{1}\\=+\frac{7.4}{4.1}\\=\frac{28}{4}\\=\frac{7}{1}= 7\)
10. \(\frac{2}{-3} . \left(\frac{-3}{12}\right)\\=+\frac{2}{3}.\frac{1}{4}\\=+\frac{2.1}{3.4}\\=\frac{2}{12}\\=\frac{1}{6}\)
11. \(\frac{-2}{-5} . \left(\frac{6}{-7}\right)\\=-\frac{2.6}{5.7}\\=-\frac{12}{35}\)
12. \(\frac{4}{13} . \left(\frac{3}{-8}\right)\\=-\frac{4.3}{13.8}\\=-\frac{12}{104}\\=-\frac{3}{26}\)