Analyze the mathematical expressions in the image and provide the mathematical OCR.

Mathematical Expressions:

1. \( 512 \)
2. \( \frac{5^2 \cdot (5^2)^3}{245} + \frac{5^{12}}{5^3 (54)^4} = 3 + \dots \)
3. \( 3^5 \)
4. \( (84 \cdot 3^{-3})^2 - 16(2^{-2})^2 \)
5. \( \frac{2^5 \cdot 128}{3^3} - \frac{3^{15}}{3^{10} \cdot 245} = 7 \)
6. \( 1 \mu = 100 \mu \text{ cm} \)