Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{4}{15} . \frac{12}{9}\)
2. \(\frac{2}{7} . \frac{9}{5}\)
3. \(\frac{11}{17} . \left(\frac{-11}{-3}\right)\)
4. \(\frac{-2}{15} . \left(\frac{11}{-3}\right)\)
5. \(\frac{3}{-4} . \left(\frac{-4}{-6}\right)\)
6. \(\frac{-8}{17} . \frac{11}{12}\)
7. \(\frac{-6}{-5} . \left(\frac{-11}{6}\right)\)
8. \(\frac{9}{19} . \frac{8}{11}\)
9. \(\frac{11}{5} . \left(\frac{-7}{8}\right)\)
10. \(\frac{8}{-17} . \left(\frac{12}{-10}\right)\)
11. \(\frac{-7}{-8} . \left(\frac{-6}{-8}\right)\)
12. \(\frac{6}{5} . \left(\frac{-3}{-10}\right)\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{4}{15} . \frac{12}{9}\\=+\frac{4}{15}.\frac{4}{3}\\=+\frac{4.4}{15.3}\\=\frac{16}{45}\)
2. \(\frac{2}{7} . \frac{9}{5}\\=+\frac{2.9}{7.5}\\=\frac{18}{35}\)
3. \(\frac{11}{17} . \left(\frac{-11}{-3}\right)\\=+\frac{11.11}{17.3}\\=\frac{121}{51}\)
4. \(\frac{-2}{15} . \left(\frac{11}{-3}\right)\\=+\frac{2.11}{15.3}\\=\frac{22}{45}\)
5. \(\frac{3}{-4} . \left(\frac{-4}{-6}\right)\\=-\frac{3}{4}.\frac{2}{3}\\=-\frac{3.2}{4.3}\\=-\frac{6}{12}\\=-\frac{1}{2}\)
6. \(\frac{-8}{17} . \frac{11}{12}\\=-\frac{8.11}{17.12}\\=-\frac{88}{204}\\=-\frac{22}{51}\)
7. \(\frac{-6}{-5} . \left(\frac{-11}{6}\right)\\=-\frac{6.11}{5.6}\\=-\frac{66}{30}\\=-\frac{11}{5}\)
8. \(\frac{9}{19} . \frac{8}{11}\\=+\frac{9.8}{19.11}\\=\frac{72}{209}\)
9. \(\frac{11}{5} . \left(\frac{-7}{8}\right)\\=-\frac{11.7}{5.8}\\=-\frac{77}{40}\)
10. \(\frac{8}{-17} . \left(\frac{12}{-10}\right)\\=+\frac{8}{17}.\frac{6}{5}\\=+\frac{8.6}{17.5}\\=\frac{48}{85}\)
11. \(\frac{-7}{-8} . \left(\frac{-6}{-8}\right)\\=+\frac{7}{8}.\frac{3}{4}\\=+\frac{7.3}{8.4}\\=\frac{21}{32}\)
12. \(\frac{6}{5} . \left(\frac{-3}{-10}\right)\\=+\frac{6.3}{5.10}\\=\frac{18}{50}\\=\frac{9}{25}\)