Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{7}{-3} . \frac{12}{4}\\=-\frac{7}{3}.\frac{3}{1}\\=-\frac{7.3}{3.1}\\=-\frac{21}{3}\\=-\frac{7}{1}= 7\)
2. \(\frac{8}{-17} . \frac{12}{7}\\=-\frac{8.12}{17.7}\\=-\frac{96}{119}\)
3. \(\frac{-6}{-17} . \frac{8}{7}\\=+\frac{6.8}{17.7}\\=\frac{48}{119}\)
4. \(\frac{3}{-11} . \left(\frac{-3}{-5}\right)\\=-\frac{3.3}{11.5}\\=-\frac{9}{55}\)
5. \(\frac{-10}{-7} . \left(\frac{-12}{4}\right)\\=-\frac{10}{7}.\frac{3}{1}\\=-\frac{10.3}{7.1}\\=-\frac{30}{7}\)
6. \(\frac{-2}{-9} . \left(\frac{-8}{11}\right)\\=-\frac{2.8}{9.11}\\=-\frac{16}{99}\)
7. \(\frac{-12}{19} . \left(\frac{-10}{2}\right)\\=+\frac{12}{19}.\frac{5}{1}\\=+\frac{12.5}{19.1}\\=\frac{60}{19}\)
8. \(\frac{-7}{-8} . \left(\frac{-5}{4}\right)\\=-\frac{7.5}{8.4}\\=-\frac{35}{32}\)
9. \(\frac{-5}{8} . \frac{12}{3}\\=-\frac{5}{8}.\frac{4}{1}\\=-\frac{5.4}{8.1}\\=-\frac{20}{8}\\=-\frac{5}{2}\)
10. \(\frac{8}{-5} . \frac{7}{10}\\=-\frac{8.7}{5.10}\\=-\frac{56}{50}\\=-\frac{28}{25}\)
11. \(\frac{-5}{8} . \left(\frac{-7}{10}\right)\\=+\frac{5.7}{8.10}\\=\frac{35}{80}\\=\frac{7}{16}\)
12. \(\frac{-6}{-13} . \frac{2}{5}\\=+\frac{6.2}{13.5}\\=\frac{12}{65}\)