Breuken aftrekken (reeks 2)

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Trek de breuken af

1. \(\frac{-4}{13}-\frac{3}{8}\)
2. \(\frac{16}{11}-\frac{19}{18}\)
3. \(\frac{5}{9}-\frac{16}{9}\)
4. \(\frac{-20}{7}-\frac{5}{11}\)
5. \(\frac{9}{19}-\frac{11}{13}\)
6. \(\frac{-16}{11}-\frac{5}{7}\)
7. \(\frac{4}{13}-\frac{15}{4}\)
8. \(\frac{-19}{16}-\frac{15}{11}\)
9. \(\frac{-4}{5}-\frac{10}{11}\)
10. \(\frac{-8}{19}-\frac{10}{19}\)
11. \(\frac{6}{17}-\frac{15}{11}\)
12. \(\frac{9}{10}-\frac{14}{15}\)

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Trek de breuken af

Verbetersleutel

1. \(\frac{-4}{13}-\frac{3}{8}\\=\frac{-32}{104}-\frac{39}{104}\\=\frac{-32-39}{104}\\=\frac{-71}{104}\)
2. \(\frac{16}{11}-\frac{19}{18}\\=\frac{288}{198}-\frac{209}{198}\\=\frac{288-209}{198}\\=\frac{79}{198}\)
3. \(\frac{5}{9}-\frac{16}{9}\\=\frac{5-16}{9}\\=\frac{-11}{9}\)
4. \(\frac{-20}{7}-\frac{5}{11}\\=\frac{-220}{77}-\frac{35}{77}\\=\frac{-220-35}{77}\\=\frac{-255}{77}\)
5. \(\frac{9}{19}-\frac{11}{13}\\=\frac{117}{247}-\frac{209}{247}\\=\frac{117-209}{247}\\=\frac{-92}{247}\)
6. \(\frac{-16}{11}-\frac{5}{7}\\=\frac{-112}{77}-\frac{55}{77}\\=\frac{-112-55}{77}\\=\frac{-167}{77}\)
7. \(\frac{4}{13}-\frac{15}{4}\\=\frac{16}{52}-\frac{195}{52}\\=\frac{16-195}{52}\\=\frac{-179}{52}\)
8. \(\frac{-19}{16}-\frac{15}{11}\\=\frac{-209}{176}-\frac{240}{176}\\=\frac{-209-240}{176}\\=\frac{-449}{176}\)
9. \(\frac{-4}{5}-\frac{10}{11}\\=\frac{-44}{55}-\frac{50}{55}\\=\frac{-44-50}{55}\\=\frac{-94}{55}\)
10. \(\frac{-8}{19}-\frac{10}{19}\\=\frac{-8-10}{19}\\=\frac{-18}{19}\)
11. \(\frac{6}{17}-\frac{15}{11}\\=\frac{66}{187}-\frac{255}{187}\\=\frac{66-255}{187}\\=\frac{-189}{187}\)
12. \(\frac{9}{10}-\frac{14}{15}\\=\frac{27}{30}-\frac{28}{30}\\=\frac{27-28}{30}\\=\frac{-1}{30}\)