Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{-11}{9} . \left(\frac{-9}{3}\right)\)
2. \(\frac{5}{18} . \left(\frac{11}{-5}\right)\)
3. \(\frac{8}{-17} . \frac{11}{6}\)
4. \(\frac{-10}{11} . \left(\frac{6}{-9}\right)\)
5. \(\frac{-9}{16} . \left(\frac{4}{-4}\right)\)
6. \(\frac{10}{11} . \left(\frac{-6}{2}\right)\)
7. \(\frac{-6}{-11} . \left(\frac{-8}{-12}\right)\)
8. \(\frac{-11}{15} . \left(\frac{-4}{12}\right)\)
9. \(\frac{-7}{-11} . \left(\frac{6}{-5}\right)\)
10. \(\frac{-11}{-4} . \left(\frac{-6}{-5}\right)\)
11. \(\frac{-9}{-16} . \left(\frac{-11}{3}\right)\)
12. \(\frac{11}{12} . \frac{2}{8}\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-11}{9} . \left(\frac{-9}{3}\right)\\=+\frac{11}{9}.\frac{3}{1}\\=+\frac{11.3}{9.1}\\=\frac{33}{9}\\=\frac{11}{3}\)
2. \(\frac{5}{18} . \left(\frac{11}{-5}\right)\\=-\frac{5.11}{18.5}\\=-\frac{55}{90}\\=-\frac{11}{18}\)
3. \(\frac{8}{-17} . \frac{11}{6}\\=-\frac{8.11}{17.6}\\=-\frac{88}{102}\\=-\frac{44}{51}\)
4. \(\frac{-10}{11} . \left(\frac{6}{-9}\right)\\=+\frac{10}{11}.\frac{2}{3}\\=+\frac{10.2}{11.3}\\=\frac{20}{33}\)
5. \(\frac{-9}{16} . \left(\frac{4}{-4}\right)\\=+\frac{9}{16}.\frac{1}{1}\\=+\frac{9.1}{16.1}\\=\frac{9}{16}\)
6. \(\frac{10}{11} . \left(\frac{-6}{2}\right)\\=-\frac{10}{11}.\frac{3}{1}\\=-\frac{10.3}{11.1}\\=-\frac{30}{11}\)
7. \(\frac{-6}{-11} . \left(\frac{-8}{-12}\right)\\=+\frac{6}{11}.\frac{2}{3}\\=+\frac{6.2}{11.3}\\=\frac{12}{33}\\=\frac{4}{11}\)
8. \(\frac{-11}{15} . \left(\frac{-4}{12}\right)\\=+\frac{11}{15}.\frac{1}{3}\\=+\frac{11.1}{15.3}\\=\frac{11}{45}\)
9. \(\frac{-7}{-11} . \left(\frac{6}{-5}\right)\\=-\frac{7.6}{11.5}\\=-\frac{42}{55}\)
10. \(\frac{-11}{-4} . \left(\frac{-6}{-5}\right)\\=+\frac{11.6}{4.5}\\=\frac{66}{20}\\=\frac{33}{10}\)
11. \(\frac{-9}{-16} . \left(\frac{-11}{3}\right)\\=-\frac{9.11}{16.3}\\=-\frac{99}{48}\\=-\frac{33}{16}\)
12. \(\frac{11}{12} . \frac{2}{8}\\=+\frac{11}{12}.\frac{1}{4}\\=+\frac{11.1}{12.4}\\=\frac{11}{48}\)