Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{8}{-17} . \left(\frac{4}{-9}\right)\)
2. \(\frac{7}{-16} . \left(\frac{-12}{-10}\right)\)
3. \(\frac{-8}{15} . \left(\frac{10}{-10}\right)\)
4. \(\frac{-5}{13} . \left(\frac{-12}{-3}\right)\)
5. \(\frac{-9}{-5} . \left(\frac{8}{-4}\right)\)
6. \(\frac{-7}{-15} . \left(\frac{-5}{8}\right)\)
7. \(\frac{-10}{-3} . \left(\frac{8}{-5}\right)\)
8. \(\frac{-7}{12} . \left(\frac{-8}{-8}\right)\)
9. \(\frac{-6}{-19} . \frac{10}{2}\)
10. \(\frac{8}{17} . \frac{7}{5}\)
11. \(\frac{4}{-19} . \left(\frac{10}{-12}\right)\)
12. \(\frac{10}{13} . \left(\frac{-3}{-2}\right)\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{8}{-17} . \left(\frac{4}{-9}\right)\\=+\frac{8.4}{17.9}\\=\frac{32}{153}\)
2. \(\frac{7}{-16} . \left(\frac{-12}{-10}\right)\\=-\frac{7}{16}.\frac{6}{5}\\=-\frac{7.6}{16.5}\\=-\frac{42}{80}\\=-\frac{21}{40}\)
3. \(\frac{-8}{15} . \left(\frac{10}{-10}\right)\\=+\frac{8}{15}.\frac{1}{1}\\=+\frac{8.1}{15.1}\\=\frac{8}{15}\)
4. \(\frac{-5}{13} . \left(\frac{-12}{-3}\right)\\=-\frac{5}{13}.\frac{4}{1}\\=-\frac{5.4}{13.1}\\=-\frac{20}{13}\)
5. \(\frac{-9}{-5} . \left(\frac{8}{-4}\right)\\=-\frac{9}{5}.\frac{2}{1}\\=-\frac{9.2}{5.1}\\=-\frac{18}{5}\)
6. \(\frac{-7}{-15} . \left(\frac{-5}{8}\right)\\=-\frac{7.5}{15.8}\\=-\frac{35}{120}\\=-\frac{7}{24}\)
7. \(\frac{-10}{-3} . \left(\frac{8}{-5}\right)\\=-\frac{10.8}{3.5}\\=-\frac{80}{15}\\=-\frac{16}{3}\)
8. \(\frac{-7}{12} . \left(\frac{-8}{-8}\right)\\=-\frac{7}{12}.\frac{1}{1}\\=-\frac{7.1}{12.1}\\=-\frac{7}{12}\)
9. \(\frac{-6}{-19} . \frac{10}{2}\\=+\frac{6}{19}.\frac{5}{1}\\=+\frac{6.5}{19.1}\\=\frac{30}{19}\)
10. \(\frac{8}{17} . \frac{7}{5}\\=+\frac{8.7}{17.5}\\=\frac{56}{85}\)
11. \(\frac{4}{-19} . \left(\frac{10}{-12}\right)\\=+\frac{4}{19}.\frac{5}{6}\\=+\frac{4.5}{19.6}\\=\frac{20}{114}\\=\frac{10}{57}\)
12. \(\frac{10}{13} . \left(\frac{-3}{-2}\right)\\=+\frac{10.3}{13.2}\\=\frac{30}{26}\\=\frac{15}{13}\)