Обчисли зручним способом
[m]18\cdot (-2\frac{1}{6}+1\frac{1}{18}-4\frac{1}{2})=18\cdot (-\frac{13}{6}+\frac{19}{18}-\frac{9}{2})=[/m] [m]=18\cdot (-\frac{13}{6})+18\cdot \frac{19}{18}-18\cdot \frac{9}{2}=-39+19-81=-101[/m]