←Vrati se na zadatke1. ZadatakIzračunaj: 138⋅25−25:2271\frac{3}{8}\cdot\frac{2}{5}-\frac{2}{5}:2\frac{2}{7}183⋅52−52:272.Rješenje138⋅25−25:227=118⋅25−25:167=118⋅25−25⋅716=25(118−716)=25⋅22−716=25⋅1516=38.\begin{aligned} 1\frac{3}{8}\cdot\frac{2}{5}-\frac{2}{5}:2\frac{2}{7} &=\frac{11}{8}\cdot\frac{2}{5}-\frac{2}{5}:\frac{16}{7}\\ &=\frac{11}{8}\cdot\frac{2}{5}-\frac{2}{5}\cdot\frac{7}{16}\\ &=\frac{2}{5}\left(\frac{11}{8}-\frac{7}{16}\right)\\ &=\frac{2}{5}\cdot\frac{22-7}{16}=\frac{2}{5}\cdot\frac{15}{16}=\frac{3}{8}. \end{aligned}183⋅52−52:272=811⋅52−52:716=811⋅52−52⋅167=52(811−167)=52⋅1622−7=52⋅1615=83.
