Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-12}{-5} . \left(\frac{-6}{-9}\right)\\=+\frac{12}{5}.\frac{2}{3}\\=+\frac{12.2}{5.3}\\=\frac{24}{15}\\=\frac{8}{5}\)
2. \(\frac{-2}{-3} . \frac{5}{8}\\=+\frac{2.5}{3.8}\\=\frac{10}{24}\\=\frac{5}{12}\)
3. \(\frac{11}{4} . \left(\frac{-4}{-8}\right)\\=+\frac{11}{4}.\frac{1}{2}\\=+\frac{11.1}{4.2}\\=\frac{11}{8}\)
4. \(\frac{2}{-17} . \left(\frac{-11}{-6}\right)\\=-\frac{2.11}{17.6}\\=-\frac{22}{102}\\=-\frac{11}{51}\)
5. \(\frac{-10}{-11} . \left(\frac{-12}{-9}\right)\\=+\frac{10}{11}.\frac{4}{3}\\=+\frac{10.4}{11.3}\\=\frac{40}{33}\)
6. \(\frac{-6}{11} . \left(\frac{-10}{4}\right)\\=+\frac{6}{11}.\frac{5}{2}\\=+\frac{6.5}{11.2}\\=\frac{30}{22}\\=\frac{15}{11}\)
7. \(\frac{-9}{8} . \left(\frac{-2}{3}\right)\\=+\frac{9.2}{8.3}\\=\frac{18}{24}\\=\frac{3}{4}\)
8. \(\frac{3}{-16} . \left(\frac{7}{-5}\right)\\=+\frac{3.7}{16.5}\\=\frac{21}{80}\)
9. \(\frac{-4}{-15} . \frac{3}{7}\\=+\frac{4.3}{15.7}\\=\frac{12}{105}\\=\frac{4}{35}\)
10. \(\frac{-7}{-13} . \frac{12}{12}\\=+\frac{7}{13}.\frac{1}{1}\\=+\frac{7.1}{13.1}\\=\frac{7}{13}\)
11. \(\frac{11}{-8} . \left(\frac{2}{-9}\right)\\=+\frac{11.2}{8.9}\\=\frac{22}{72}\\=\frac{11}{36}\)
12. \(\frac{3}{-13} . \left(\frac{-4}{4}\right)\\=+\frac{3}{13}.\frac{1}{1}\\=+\frac{3.1}{13.1}\\=\frac{3}{13}\)