Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{12}{-11} . \frac{3}{7}\\=-\frac{12.3}{11.7}\\=-\frac{36}{77}\)
2. \(\frac{8}{19} . \frac{3}{4}\\=+\frac{8.3}{19.4}\\=\frac{24}{76}\\=\frac{6}{19}\)
3. \(\frac{8}{3} . \left(\frac{6}{-3}\right)\\=-\frac{8}{3}.\frac{2}{1}\\=-\frac{8.2}{3.1}\\=-\frac{16}{3}\)
4. \(\frac{-9}{4} . \left(\frac{10}{-3}\right)\\=+\frac{9.10}{4.3}\\=\frac{90}{12}\\=\frac{15}{2}\)
5. \(\frac{-8}{5} . \left(\frac{-10}{3}\right)\\=+\frac{8.10}{5.3}\\=\frac{80}{15}\\=\frac{16}{3}\)
6. \(\frac{6}{-7} . \frac{7}{7}\\=-\frac{6}{7}.\frac{1}{1}\\=-\frac{6.1}{7.1}\\=-\frac{6}{7}\)
7. \(\frac{3}{13} . \left(\frac{-8}{7}\right)\\=-\frac{3.8}{13.7}\\=-\frac{24}{91}\)
8. \(\frac{-6}{-5} . \left(\frac{-10}{7}\right)\\=-\frac{6.10}{5.7}\\=-\frac{60}{35}\\=-\frac{12}{7}\)
9. \(\frac{-11}{-13} . \frac{9}{5}\\=+\frac{11.9}{13.5}\\=\frac{99}{65}\)
10. \(\frac{-11}{8} . \left(\frac{9}{-11}\right)\\=+\frac{11.9}{8.11}\\=\frac{99}{88}\\=\frac{9}{8}\)
11. \(\frac{12}{11} . \frac{3}{8}\\=+\frac{12.3}{11.8}\\=\frac{36}{88}\\=\frac{9}{22}\)
12. \(\frac{3}{-7} . \left(\frac{12}{-8}\right)\\=+\frac{3}{7}.\frac{3}{2}\\=+\frac{3.3}{7.2}\\=\frac{9}{14}\)