Breuken verm. (reeks 2)

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Vermenigvuldig de breuken

1. \(\frac{-3}{7} . \left(\frac{-3}{9}\right)\)
2. \(\frac{6}{7} . \frac{10}{5}\)
3. \(\frac{-8}{-19} . \frac{7}{9}\)
4. \(\frac{-8}{5} . \left(\frac{11}{-3}\right)\)
5. \(\frac{-10}{-19} . \left(\frac{-11}{12}\right)\)
6. \(\frac{5}{8} . \frac{4}{5}\)
7. \(\frac{-9}{-13} . \left(\frac{-8}{11}\right)\)
8. \(\frac{6}{7} . \left(\frac{-12}{-11}\right)\)
9. \(\frac{5}{-2} . \left(\frac{-12}{8}\right)\)
10. \(\frac{-10}{3} . \frac{4}{12}\)
11. \(\frac{6}{-17} . \left(\frac{-9}{-9}\right)\)
12. \(\frac{10}{-11} . \left(\frac{-11}{8}\right)\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{-3}{7} . \left(\frac{-3}{9}\right)\\=+\frac{3}{7}.\frac{1}{3}\\=+\frac{3.1}{7.3}\\=\frac{3}{21}\\=\frac{1}{7}\)
2. \(\frac{6}{7} . \frac{10}{5}\\=+\frac{6}{7}.\frac{2}{1}\\=+\frac{6.2}{7.1}\\=\frac{12}{7}\)
3. \(\frac{-8}{-19} . \frac{7}{9}\\=+\frac{8.7}{19.9}\\=\frac{56}{171}\)
4. \(\frac{-8}{5} . \left(\frac{11}{-3}\right)\\=+\frac{8.11}{5.3}\\=\frac{88}{15}\)
5. \(\frac{-10}{-19} . \left(\frac{-11}{12}\right)\\=-\frac{10.11}{19.12}\\=-\frac{110}{228}\\=-\frac{55}{114}\)
6. \(\frac{5}{8} . \frac{4}{5}\\=+\frac{5.4}{8.5}\\=\frac{20}{40}\\=\frac{1}{2}\)
7. \(\frac{-9}{-13} . \left(\frac{-8}{11}\right)\\=-\frac{9.8}{13.11}\\=-\frac{72}{143}\)
8. \(\frac{6}{7} . \left(\frac{-12}{-11}\right)\\=+\frac{6.12}{7.11}\\=\frac{72}{77}\)
9. \(\frac{5}{-2} . \left(\frac{-12}{8}\right)\\=+\frac{5}{2}.\frac{3}{2}\\=+\frac{5.3}{2.2}\\=\frac{15}{4}\)
10. \(\frac{-10}{3} . \frac{4}{12}\\=-\frac{10}{3}.\frac{1}{3}\\=-\frac{10.1}{3.3}\\=-\frac{10}{9}\)
11. \(\frac{6}{-17} . \left(\frac{-9}{-9}\right)\\=-\frac{6}{17}.\frac{1}{1}\\=-\frac{6.1}{17.1}\\=-\frac{6}{17}\)
12. \(\frac{10}{-11} . \left(\frac{-11}{8}\right)\\=+\frac{10.11}{11.8}\\=\frac{110}{88}\\=\frac{5}{4}\)