Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{10}{7} . \left(\frac{-4}{3}\right)\)
2. \(\frac{-6}{-17} . \left(\frac{8}{-3}\right)\)
3. \(\frac{-5}{12} . \left(\frac{-3}{9}\right)\)
4. \(\frac{6}{11} . \left(\frac{-11}{-7}\right)\)
5. \(\frac{3}{10} . \left(\frac{-6}{10}\right)\)
6. \(\frac{-12}{11} . \frac{7}{11}\)
7. \(\frac{7}{-18} . \left(\frac{-11}{3}\right)\)
8. \(\frac{-2}{-9} . \left(\frac{-2}{6}\right)\)
9. \(\frac{8}{19} . \left(\frac{-7}{2}\right)\)
10. \(\frac{6}{5} . \frac{3}{7}\)
11. \(\frac{4}{11} . \left(\frac{10}{-2}\right)\)
12. \(\frac{-11}{-16} . \left(\frac{-10}{7}\right)\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{10}{7} . \left(\frac{-4}{3}\right)\\=-\frac{10.4}{7.3}\\=-\frac{40}{21}\)
2. \(\frac{-6}{-17} . \left(\frac{8}{-3}\right)\\=-\frac{6.8}{17.3}\\=-\frac{48}{51}\\=-\frac{16}{17}\)
3. \(\frac{-5}{12} . \left(\frac{-3}{9}\right)\\=+\frac{5}{12}.\frac{1}{3}\\=+\frac{5.1}{12.3}\\=\frac{5}{36}\)
4. \(\frac{6}{11} . \left(\frac{-11}{-7}\right)\\=+\frac{6.11}{11.7}\\=\frac{66}{77}\\=\frac{6}{7}\)
5. \(\frac{3}{10} . \left(\frac{-6}{10}\right)\\=-\frac{3}{10}.\frac{3}{5}\\=-\frac{3.3}{10.5}\\=-\frac{9}{50}\)
6. \(\frac{-12}{11} . \frac{7}{11}\\=-\frac{12.7}{11.11}\\=-\frac{84}{121}\)
7. \(\frac{7}{-18} . \left(\frac{-11}{3}\right)\\=+\frac{7.11}{18.3}\\=\frac{77}{54}\)
8. \(\frac{-2}{-9} . \left(\frac{-2}{6}\right)\\=-\frac{2}{9}.\frac{1}{3}\\=-\frac{2.1}{9.3}\\=-\frac{2}{27}\)
9. \(\frac{8}{19} . \left(\frac{-7}{2}\right)\\=-\frac{8.7}{19.2}\\=-\frac{56}{38}\\=-\frac{28}{19}\)
10. \(\frac{6}{5} . \frac{3}{7}\\=+\frac{6.3}{5.7}\\=\frac{18}{35}\)
11. \(\frac{4}{11} . \left(\frac{10}{-2}\right)\\=-\frac{4}{11}.\frac{5}{1}\\=-\frac{4.5}{11.1}\\=-\frac{20}{11}\)
12. \(\frac{-11}{-16} . \left(\frac{-10}{7}\right)\\=-\frac{11.10}{16.7}\\=-\frac{110}{112}\\=-\frac{55}{56}\)