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Risolvere le seguenti somme di frazioni

SEMPLICE MEDIO DIFFICILE

  1. $$\frac23+\frac43=$$
  2. $$\frac75+\frac45+\frac{12}5=$$
  3. $$\frac{1}{9}+\frac{2}{3}+\frac{5}{6}=$$
  4. $$\frac23+\frac35+\frac42$$
  5. $$\frac14+\frac23+\frac25+\frac32$$
  6. $$1+\frac13+\frac5{12}$$