Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-3}{10} . \frac{8}{11}\\=-\frac{3.8}{10.11}\\=-\frac{24}{110}\\=-\frac{12}{55}\)
2. \(\frac{-2}{-3} . \left(\frac{-9}{-7}\right)\\=+\frac{2.9}{3.7}\\=\frac{18}{21}\\=\frac{6}{7}\)
3. \(\frac{-7}{-9} . \frac{11}{11}\\=+\frac{7}{9}.\frac{1}{1}\\=+\frac{7.1}{9.1}\\=\frac{7}{9}\)
4. \(\frac{12}{19} . \frac{8}{3}\\=+\frac{12.8}{19.3}\\=\frac{96}{57}\\=\frac{32}{19}\)
5. \(\frac{-10}{-3} . \left(\frac{-11}{12}\right)\\=-\frac{10.11}{3.12}\\=-\frac{110}{36}\\=-\frac{55}{18}\)
6. \(\frac{-9}{-11} . \frac{6}{10}\\=+\frac{9}{11}.\frac{3}{5}\\=+\frac{9.3}{11.5}\\=\frac{27}{55}\)
7. \(\frac{-10}{-11} . \left(\frac{-10}{11}\right)\\=-\frac{10.10}{11.11}\\=-\frac{100}{121}\)
8. \(\frac{-10}{17} . \left(\frac{2}{-3}\right)\\=+\frac{10.2}{17.3}\\=\frac{20}{51}\)
9. \(\frac{12}{-7} . \frac{2}{2}\\=-\frac{12}{7}.\frac{1}{1}\\=-\frac{12.1}{7.1}\\=-\frac{12}{7}\)
10. \(\frac{-2}{-15} . \left(\frac{8}{-8}\right)\\=-\frac{2}{15}.\frac{1}{1}\\=-\frac{2.1}{15.1}\\=-\frac{2}{15}\)
11. \(\frac{-10}{-19} . \frac{8}{6}\\=+\frac{10}{19}.\frac{4}{3}\\=+\frac{10.4}{19.3}\\=\frac{40}{57}\)
12. \(\frac{5}{-12} . \left(\frac{-7}{-3}\right)\\=-\frac{5.7}{12.3}\\=-\frac{35}{36}\)