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Trovare la frazione complementare delle seguenti frazioni

SEMPLICE MEDIO DIFFICILE

  1. $$\frac5{12}\Rightarrow\frac{12-5}{12}=\frac7{12}$$
  2. $$\frac3{21}\Rightarrow\frac{21-3}{21}=\frac7{21}$$
  3. $$\frac9{10}\Rightarrow\frac{10-9}{10}=\frac1{10}$$
  4. $$\frac{15}{28}\Rightarrow\frac{28-15}{28}=\frac{13}{28}$$
  5. $$\frac{16}{40}\Rightarrow\frac{40-16}{40}=\frac{24}{40}$$