Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{8}{-7} . \left(\frac{-3}{2}\right)\\=+\frac{8.3}{7.2}\\=\frac{24}{14}\\=\frac{12}{7}\)
2. \(\frac{8}{3} . \left(\frac{-9}{3}\right)\\=-\frac{8}{3}.\frac{3}{1}\\=-\frac{8.3}{3.1}\\=-\frac{24}{3}\\=-\frac{8}{1}= 8\)
3. \(\frac{5}{-16} . \left(\frac{10}{-12}\right)\\=+\frac{5}{16}.\frac{5}{6}\\=+\frac{5.5}{16.6}\\=\frac{25}{96}\)
4. \(\frac{-9}{16} . \frac{5}{4}\\=-\frac{9.5}{16.4}\\=-\frac{45}{64}\)
5. \(\frac{-3}{-16} . \left(\frac{-6}{7}\right)\\=-\frac{3.6}{16.7}\\=-\frac{18}{112}\\=-\frac{9}{56}\)
6. \(\frac{8}{7} . \frac{4}{9}\\=+\frac{8.4}{7.9}\\=\frac{32}{63}\)
7. \(\frac{-9}{11} . \left(\frac{2}{-8}\right)\\=+\frac{9}{11}.\frac{1}{4}\\=+\frac{9.1}{11.4}\\=\frac{9}{44}\)
8. \(\frac{-8}{19} . \left(\frac{-6}{2}\right)\\=+\frac{8}{19}.\frac{3}{1}\\=+\frac{8.3}{19.1}\\=\frac{24}{19}\)
9. \(\frac{-7}{-9} . \left(\frac{9}{-9}\right)\\=-\frac{7}{9}.\frac{1}{1}\\=-\frac{7.1}{9.1}\\=-\frac{7}{9}\)
10. \(\frac{6}{11} . \left(\frac{-4}{-8}\right)\\=+\frac{6}{11}.\frac{1}{2}\\=+\frac{6.1}{11.2}\\=\frac{6}{22}\\=\frac{3}{11}\)
11. \(\frac{9}{-4} . \left(\frac{-4}{6}\right)\\=+\frac{9}{4}.\frac{2}{3}\\=+\frac{9.2}{4.3}\\=\frac{18}{12}\\=\frac{3}{2}\)
12. \(\frac{-11}{-2} . \left(\frac{8}{-11}\right)\\=-\frac{11.8}{2.11}\\=-\frac{88}{22}\\=-\frac{4}{1}= 4\)