7. Calculati: [tex]a) |1 \frac{1}{2} - \frac{2}{3} | + | \frac{3}{4} - 1 \frac{1}{6} | [/tex]
[tex]c) | \frac{6}{5} - 2 \frac{1}{6} | + | \frac{2}{3} - 2 \frac{1}{2} | [/tex]
dau coroană​