Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{10}{-19} . \frac{2}{10}\\=-\frac{10}{19}.\frac{1}{5}\\=-\frac{10.1}{19.5}\\=-\frac{10}{95}\\=-\frac{2}{19}\)
2. \(\frac{2}{-13} . \frac{4}{11}\\=-\frac{2.4}{13.11}\\=-\frac{8}{143}\)
3. \(\frac{-9}{19} . \frac{12}{4}\\=-\frac{9}{19}.\frac{3}{1}\\=-\frac{9.3}{19.1}\\=-\frac{27}{19}\)
4. \(\frac{10}{3} . \left(\frac{-2}{-3}\right)\\=+\frac{10.2}{3.3}\\=\frac{20}{9}\)
5. \(\frac{11}{14} . \frac{12}{3}\\=+\frac{11}{14}.\frac{4}{1}\\=+\frac{11.4}{14.1}\\=\frac{44}{14}\\=\frac{22}{7}\)
6. \(\frac{3}{2} . \left(\frac{-4}{6}\right)\\=-\frac{3}{2}.\frac{2}{3}\\=-\frac{3.2}{2.3}\\=-\frac{6}{6}\\=-\frac{1}{1}= 1\)
7. \(\frac{6}{-7} . \left(\frac{-10}{-10}\right)\\=-\frac{6}{7}.\frac{1}{1}\\=-\frac{6.1}{7.1}\\=-\frac{6}{7}\)
8. \(\frac{9}{-5} . \left(\frac{6}{-10}\right)\\=+\frac{9}{5}.\frac{3}{5}\\=+\frac{9.3}{5.5}\\=\frac{27}{25}\)
9. \(\frac{-4}{5} . \left(\frac{-8}{-12}\right)\\=-\frac{4}{5}.\frac{2}{3}\\=-\frac{4.2}{5.3}\\=-\frac{8}{15}\)
10. \(\frac{11}{2} . \left(\frac{-7}{5}\right)\\=-\frac{11.7}{2.5}\\=-\frac{77}{10}\)
11. \(\frac{-7}{5} . \frac{5}{7}\\=-\frac{7.5}{5.7}\\=-\frac{35}{35}\\=-\frac{1}{1}= 1\)
12. \(\frac{-5}{2} . \left(\frac{2}{-11}\right)\\=+\frac{5.2}{2.11}\\=\frac{10}{22}\\=\frac{5}{11}\)