Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-7}{5} . \frac{2}{7}\\=-\frac{7.2}{5.7}\\=-\frac{14}{35}\\=-\frac{2}{5}\)
2. \(\frac{7}{-19} . \left(\frac{6}{-11}\right)\\=+\frac{7.6}{19.11}\\=\frac{42}{209}\)
3. \(\frac{3}{-16} . \left(\frac{-7}{-5}\right)\\=-\frac{3.7}{16.5}\\=-\frac{21}{80}\)
4. \(\frac{9}{-10} . \left(\frac{-9}{-7}\right)\\=-\frac{9.9}{10.7}\\=-\frac{81}{70}\)
5. \(\frac{7}{-2} . \left(\frac{-5}{12}\right)\\=+\frac{7.5}{2.12}\\=\frac{35}{24}\)
6. \(\frac{8}{-11} . \left(\frac{4}{-8}\right)\\=+\frac{8}{11}.\frac{1}{2}\\=+\frac{8.1}{11.2}\\=\frac{8}{22}\\=\frac{4}{11}\)
7. \(\frac{4}{-3} . \left(\frac{-6}{-8}\right)\\=-\frac{4}{3}.\frac{3}{4}\\=-\frac{4.3}{3.4}\\=-\frac{12}{12}\\=-\frac{1}{1}= 1\)
8. \(\frac{4}{17} . \left(\frac{-11}{-7}\right)\\=+\frac{4.11}{17.7}\\=\frac{44}{119}\)
9. \(\frac{8}{19} . \left(\frac{6}{-12}\right)\\=-\frac{8}{19}.\frac{1}{2}\\=-\frac{8.1}{19.2}\\=-\frac{8}{38}\\=-\frac{4}{19}\)
10. \(\frac{12}{7} . \left(\frac{-10}{12}\right)\\=-\frac{12}{7}.\frac{5}{6}\\=-\frac{12.5}{7.6}\\=-\frac{60}{42}\\=-\frac{10}{7}\)
11. \(\frac{12}{13} . \left(\frac{-11}{8}\right)\\=-\frac{12.11}{13.8}\\=-\frac{132}{104}\\=-\frac{33}{26}\)
12. \(\frac{-4}{-13} . \left(\frac{5}{-5}\right)\\=-\frac{4}{13}.\frac{1}{1}\\=-\frac{4.1}{13.1}\\=-\frac{4}{13}\)