Explicație pas cu pas:
[tex] |a| = |2 \frac{11}{18} + ( - \frac{5}{6} ) + ( - 1 \frac{7}{8} )| = |\frac{47}{18} - \frac{5}{6}- \frac{15}{8}| = |\frac{ 4\times 47 - 5 \times 12 - 9 \times 15}{72}| = |\frac{188 - 60 - 135}{72}| = |- \frac{15}{72}| = |- \frac{5}{24} | = \frac{5}{24} [/tex]