Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{11}{-20} . \frac{7}{12}\)
2. \(\frac{6}{11} . \left(\frac{9}{-9}\right)\)
3. \(\frac{2}{-5} . \left(\frac{-4}{9}\right)\)
4. \(\frac{9}{-14} . \left(\frac{6}{-8}\right)\)
5. \(\frac{-11}{-12} . \left(\frac{-2}{4}\right)\)
6. \(\frac{6}{5} . \left(\frac{-3}{-12}\right)\)
7. \(\frac{-9}{-4} . \left(\frac{-7}{12}\right)\)
8. \(\frac{-10}{-11} . \frac{12}{2}\)
9. \(\frac{11}{19} . \left(\frac{-12}{-10}\right)\)
10. \(\frac{-10}{7} . \frac{7}{9}\)
11. \(\frac{11}{9} . \left(\frac{-9}{-7}\right)\)
12. \(\frac{-6}{-11} . \frac{6}{11}\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{11}{-20} . \frac{7}{12}\\=-\frac{11.7}{20.12}\\=-\frac{77}{240}\)
2. \(\frac{6}{11} . \left(\frac{9}{-9}\right)\\=-\frac{6}{11}.\frac{1}{1}\\=-\frac{6.1}{11.1}\\=-\frac{6}{11}\)
3. \(\frac{2}{-5} . \left(\frac{-4}{9}\right)\\=+\frac{2.4}{5.9}\\=\frac{8}{45}\)
4. \(\frac{9}{-14} . \left(\frac{6}{-8}\right)\\=+\frac{9}{14}.\frac{3}{4}\\=+\frac{9.3}{14.4}\\=\frac{27}{56}\)
5. \(\frac{-11}{-12} . \left(\frac{-2}{4}\right)\\=-\frac{11}{12}.\frac{1}{2}\\=-\frac{11.1}{12.2}\\=-\frac{11}{24}\)
6. \(\frac{6}{5} . \left(\frac{-3}{-12}\right)\\=+\frac{6}{5}.\frac{1}{4}\\=+\frac{6.1}{5.4}\\=\frac{6}{20}\\=\frac{3}{10}\)
7. \(\frac{-9}{-4} . \left(\frac{-7}{12}\right)\\=-\frac{9.7}{4.12}\\=-\frac{63}{48}\\=-\frac{21}{16}\)
8. \(\frac{-10}{-11} . \frac{12}{2}\\=+\frac{10}{11}.\frac{6}{1}\\=+\frac{10.6}{11.1}\\=\frac{60}{11}\)
9. \(\frac{11}{19} . \left(\frac{-12}{-10}\right)\\=+\frac{11}{19}.\frac{6}{5}\\=+\frac{11.6}{19.5}\\=\frac{66}{95}\)
10. \(\frac{-10}{7} . \frac{7}{9}\\=-\frac{10.7}{7.9}\\=-\frac{70}{63}\\=-\frac{10}{9}\)
11. \(\frac{11}{9} . \left(\frac{-9}{-7}\right)\\=+\frac{11.9}{9.7}\\=\frac{99}{63}\\=\frac{11}{7}\)
12. \(\frac{-6}{-11} . \frac{6}{11}\\=+\frac{6.6}{11.11}\\=\frac{36}{121}\)