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Calcola il valore delle seguenti espressioni

SEMPLICE MEDIO DIFFICILE

  1. $$\frac{4}{3}-\frac{1}{2}+\frac{5}{12}-2+\frac{1}{4}-3$$
  2. $$\frac{1}{2}-\frac{2}{3}-\frac{1}{7}+\frac{4}{21}+\frac{1}{2}+\frac{3}{7}-\frac{1}{21}$$
  3. $$2+\frac{1}{2}-\frac{3}{5}-3+\frac{1}{5}$$
  4. $$\frac{5}{6}+1-\frac{3}{2}+\frac{4}{3}-2$$
  5. $$\left[\frac{1}{2}+2-\left(\frac{5}{3}+\frac{1}{2}-2\right)+\frac{4}{3}-\frac{1}{6}+\frac{1}{2}\right]$$
  6. $$\frac{1}{2}-\left [ \frac{2}{3}-1+\frac{3}{4}-\left ( 2+\frac{2}{3}-\frac{1}{12} \right )+\frac{4}{3} \right ]$$
  7. $$3+\frac{1}{2}-\left [ \frac{1}{2}+2-\left ( \frac{5}{3}+\frac{1}{2}- 2\right )+\frac{4}{3}-\frac{1}{6}+\frac{1}{2} \right ]$$
  8. $$\left ( \frac{1}{2} +\frac{2}{5}\right )-\left [ \frac{3}{5}+2-\frac{1}{10}+\left ( \frac{3}{2}-\frac{1}{5} \right )+1-\frac{3}{10} \right ]$$
  9. $$\left\{ \left[ -\dfrac{7}{5}+\left( 3-\dfrac{30}{21}+\dfrac{1}{7}\right) \right] -\left( \dfrac{4}{5}-\dfrac{2}{7}\right) \right\} +\dfrac{1}{5}$$
  10. $$\frac{3}{4}-\left \{ \frac{1}{5}+2+\left [ 3+\frac{1}{4}-1-\left ( \frac{3}{5}-2 \right )-\frac{3}{20}-4 \right ]+\frac{3}{5} -\frac{7}{10}\right\}$$
  11. $$\frac{5}{6}-\left\{2-\frac{1}{3} -\left [ \frac{1}{2}-2+\left ( \frac{2}{3}-\frac{1}{6}+\frac{1}{12} \right )-3+\frac{5}{6} \right ]-3+\frac{5}{12} \right\}$$