Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{11}{-4} . \left(\frac{-10}{-5}\right)\\=-\frac{11}{4}.\frac{2}{1}\\=-\frac{11.2}{4.1}\\=-\frac{22}{4}\\=-\frac{11}{2}\)
2. \(\frac{7}{5} . \left(\frac{5}{-2}\right)\\=-\frac{7.5}{5.2}\\=-\frac{35}{10}\\=-\frac{7}{2}\)
3. \(\frac{7}{-2} . \frac{11}{10}\\=-\frac{7.11}{2.10}\\=-\frac{77}{20}\)
4. \(\frac{12}{11} . \frac{9}{2}\\=+\frac{12.9}{11.2}\\=\frac{108}{22}\\=\frac{54}{11}\)
5. \(\frac{4}{-5} . \left(\frac{-9}{7}\right)\\=+\frac{4.9}{5.7}\\=\frac{36}{35}\)
6. \(\frac{-12}{11} . \left(\frac{-12}{2}\right)\\=+\frac{12}{11}.\frac{6}{1}\\=+\frac{12.6}{11.1}\\=\frac{72}{11}\)
7. \(\frac{10}{13} . \frac{5}{3}\\=+\frac{10.5}{13.3}\\=\frac{50}{39}\)
8. \(\frac{10}{11} . \left(\frac{2}{-9}\right)\\=-\frac{10.2}{11.9}\\=-\frac{20}{99}\)
9. \(\frac{-10}{-13} . \left(\frac{-6}{2}\right)\\=-\frac{10}{13}.\frac{3}{1}\\=-\frac{10.3}{13.1}\\=-\frac{30}{13}\)
10. \(\frac{5}{17} . \frac{8}{10}\\=+\frac{5}{17}.\frac{4}{5}\\=+\frac{5.4}{17.5}\\=\frac{20}{85}\\=\frac{4}{17}\)
11. \(\frac{11}{12} . \left(\frac{-9}{-4}\right)\\=+\frac{11.9}{12.4}\\=\frac{99}{48}\\=\frac{33}{16}\)
12. \(\frac{6}{-13} . \left(\frac{-11}{-7}\right)\\=-\frac{6.11}{13.7}\\=-\frac{66}{91}\)