Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{12}{-5} . \left(\frac{-7}{12}\right)\\=+\frac{12.7}{5.12}\\=\frac{84}{60}\\=\frac{7}{5}\)
2. \(\frac{-12}{7} . \left(\frac{-11}{-2}\right)\\=-\frac{12.11}{7.2}\\=-\frac{132}{14}\\=-\frac{66}{7}\)
3. \(\frac{-7}{2} . \left(\frac{-7}{7}\right)\\=+\frac{7}{2}.\frac{1}{1}\\=+\frac{7.1}{2.1}\\=\frac{7}{2}\)
4. \(\frac{11}{13} . \left(\frac{-3}{-3}\right)\\=+\frac{11}{13}.\frac{1}{1}\\=+\frac{11.1}{13.1}\\=\frac{11}{13}\)
5. \(\frac{-6}{17} . \left(\frac{2}{-12}\right)\\=+\frac{6}{17}.\frac{1}{6}\\=+\frac{6.1}{17.6}\\=\frac{6}{102}\\=\frac{1}{17}\)
6. \(\frac{9}{17} . \left(\frac{-2}{-7}\right)\\=+\frac{9.2}{17.7}\\=\frac{18}{119}\)
7. \(\frac{12}{13} . \left(\frac{-2}{-8}\right)\\=+\frac{12}{13}.\frac{1}{4}\\=+\frac{12.1}{13.4}\\=\frac{12}{52}\\=\frac{3}{13}\)
8. \(\frac{4}{5} . \left(\frac{-5}{12}\right)\\=-\frac{4.5}{5.12}\\=-\frac{20}{60}\\=-\frac{1}{3}\)
9. \(\frac{-10}{11} . \left(\frac{12}{-3}\right)\\=+\frac{10}{11}.\frac{4}{1}\\=+\frac{10.4}{11.1}\\=\frac{40}{11}\)
10. \(\frac{-10}{17} . \left(\frac{-2}{-6}\right)\\=-\frac{10}{17}.\frac{1}{3}\\=-\frac{10.1}{17.3}\\=-\frac{10}{51}\)
11. \(\frac{3}{16} . \left(\frac{-10}{-5}\right)\\=+\frac{3}{16}.\frac{2}{1}\\=+\frac{3.2}{16.1}\\=\frac{6}{16}\\=\frac{3}{8}\)
12. \(\frac{-6}{5} . \left(\frac{-9}{-3}\right)\\=-\frac{6}{5}.\frac{3}{1}\\=-\frac{6.3}{5.1}\\=-\frac{18}{5}\)