\frac{1}{5}a²b² + \frac{2}{5}a²b + \frac{3}{5}ab² + \frac{4}{5}a²b² = \frac{1}{5}a²b² + \frac{4}{5}a²b² + \frac{2}{5}a²b + \frac{3}{5}ab² = \frac{5}{5}a²b² + \frac{2}{5}a²b + \frac{3}{5}ab² = a²b² + \frac{2}{5}a²b + \frac{3}{5}ab² = a²b² + \frac{2}{5}a²b + \frac{3}{5}ab²