# Breuken verm. (reeks 2)

#### Vermenigvuldig de breuken

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

#### Vermenigvuldig de breuken

##### Verbetersleutel

1. $$\frac{12}{19} . \frac{10}{6}\\=+\frac{12}{19}.\frac{5}{3}\\=+\frac{12.5}{19.3}\\=\frac{60}{57}\\=\frac{20}{19}$$
2. $$\frac{5}{17} . \frac{8}{9}\\=+\frac{5.8}{17.9}\\=\frac{40}{153}$$
3. $$\frac{-5}{7} . \left(\frac{4}{-10}\right)\\=+\frac{5}{7}.\frac{2}{5}\\=+\frac{5.2}{7.5}\\=\frac{10}{35}\\=\frac{2}{7}$$
4. $$\frac{10}{-11} . \frac{10}{10}\\=-\frac{10}{11}.\frac{1}{1}\\=-\frac{10.1}{11.1}\\=-\frac{10}{11}$$
5. $$\frac{2}{13} . \left(\frac{-2}{8}\right)\\=-\frac{2}{13}.\frac{1}{4}\\=-\frac{2.1}{13.4}\\=-\frac{2}{52}\\=-\frac{1}{26}$$
6. $$\frac{8}{-17} . \left(\frac{-5}{4}\right)\\=+\frac{8.5}{17.4}\\=\frac{40}{68}\\=\frac{10}{17}$$
7. $$\frac{-12}{-11} . \left(\frac{8}{-9}\right)\\=-\frac{12.8}{11.9}\\=-\frac{96}{99}\\=-\frac{32}{33}$$
8. $$\frac{2}{7} . \left(\frac{-8}{4}\right)\\=-\frac{2}{7}.\frac{2}{1}\\=-\frac{2.2}{7.1}\\=-\frac{4}{7}$$
9. $$\frac{-11}{-5} . \left(\frac{-8}{-4}\right)\\=+\frac{11}{5}.\frac{2}{1}\\=+\frac{11.2}{5.1}\\=\frac{22}{5}$$
10. $$\frac{-6}{19} . \left(\frac{-7}{2}\right)\\=+\frac{6.7}{19.2}\\=\frac{42}{38}\\=\frac{21}{19}$$
11. $$\frac{-8}{3} . \left(\frac{-4}{-6}\right)\\=-\frac{8}{3}.\frac{2}{3}\\=-\frac{8.2}{3.3}\\=-\frac{16}{9}$$
12. $$\frac{3}{5} . \left(\frac{-10}{7}\right)\\=-\frac{3.10}{5.7}\\=-\frac{30}{35}\\=-\frac{6}{7}$$
Oefeningengenerator vanhoeckes.be/wiskunde 2022-06-27 07:10:53