The user has provided an image containing mathematical expressions. I need to transcribe and potentially solve them based on the context.

Mathematical Expressions Found:

• 3
• 6
• 1
• 4
• 7
• 2
• 3,75 : 1\frac{1}{2} + (1,5 : 3\frac{3}{4}) \cdot 2\frac{1}{2} + 1\frac{1}{7} - \frac{23}{49} \cdot \frac{2}{147}
• 25.04
• 3
• 6
• 1
• 4
• 7
• 2
• 5
• \frac{17}{36}
• \frac{18}{65}
• 2 : 3,2 + (3 \frac{1}{3} : 25 : 13) : \frac{2}{3} - (2\frac{5}{18} - \frac{17}{36})^5 \cdot \frac{18}{65}
• 375 3