Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{-4}{11} . \left(\frac{-8}{-9}\right)\)
2. \(\frac{5}{-11} . \left(\frac{-11}{-9}\right)\)
3. \(\frac{9}{-16} . \frac{10}{12}\)
4. \(\frac{-7}{15} . \frac{2}{11}\)
5. \(\frac{-3}{-8} . \frac{2}{5}\)
6. \(\frac{3}{10} . \left(\frac{-2}{9}\right)\)
7. \(\frac{-5}{11} . \left(\frac{11}{-11}\right)\)
8. \(\frac{-10}{-3} . \left(\frac{8}{-9}\right)\)
9. \(\frac{-2}{19} . \frac{8}{8}\)
10. \(\frac{12}{19} . \left(\frac{-6}{5}\right)\)
11. \(\frac{-9}{13} . \frac{5}{9}\)
12. \(\frac{3}{16} . \left(\frac{-11}{-11}\right)\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-4}{11} . \left(\frac{-8}{-9}\right)\\=-\frac{4.8}{11.9}\\=-\frac{32}{99}\)
2. \(\frac{5}{-11} . \left(\frac{-11}{-9}\right)\\=-\frac{5.11}{11.9}\\=-\frac{55}{99}\\=-\frac{5}{9}\)
3. \(\frac{9}{-16} . \frac{10}{12}\\=-\frac{9}{16}.\frac{5}{6}\\=-\frac{9.5}{16.6}\\=-\frac{45}{96}\\=-\frac{15}{32}\)
4. \(\frac{-7}{15} . \frac{2}{11}\\=-\frac{7.2}{15.11}\\=-\frac{14}{165}\)
5. \(\frac{-3}{-8} . \frac{2}{5}\\=+\frac{3.2}{8.5}\\=\frac{6}{40}\\=\frac{3}{20}\)
6. \(\frac{3}{10} . \left(\frac{-2}{9}\right)\\=-\frac{3.2}{10.9}\\=-\frac{6}{90}\\=-\frac{1}{15}\)
7. \(\frac{-5}{11} . \left(\frac{11}{-11}\right)\\=+\frac{5}{11}.\frac{1}{1}\\=+\frac{5.1}{11.1}\\=\frac{5}{11}\)
8. \(\frac{-10}{-3} . \left(\frac{8}{-9}\right)\\=-\frac{10.8}{3.9}\\=-\frac{80}{27}\)
9. \(\frac{-2}{19} . \frac{8}{8}\\=-\frac{2}{19}.\frac{1}{1}\\=-\frac{2.1}{19.1}\\=-\frac{2}{19}\)
10. \(\frac{12}{19} . \left(\frac{-6}{5}\right)\\=-\frac{12.6}{19.5}\\=-\frac{72}{95}\)
11. \(\frac{-9}{13} . \frac{5}{9}\\=-\frac{9.5}{13.9}\\=-\frac{45}{117}\\=-\frac{5}{13}\)
12. \(\frac{3}{16} . \left(\frac{-11}{-11}\right)\\=+\frac{3}{16}.\frac{1}{1}\\=+\frac{3.1}{16.1}\\=\frac{3}{16}\)