The problem consists of simplifying or solving the expressions provided in the image. Let’s tackle each of the expressions systematically:

Expression A:

$A = \frac{81^2 \times 8^2 \times 121^2}{1252^2 \times 147}$

We'll simplify $81^2, 8^2, 121^2, 1252^2$, and compute the division.

Expression B:

$B = \frac{0.0081 \times (0.0021)^2 \times 256^3}{320^2 \times (0.0064)^5}$

This involves simplifying decimal powers and large integer powers, then performing the multiplication and division.

Expression C:

$C = \frac{3.072144 \times 0.125 \times 216^3}{256^2 \times 0.0081}$

We'll compute powers $216^3$ and $256^2$, followed by the multiplications and division.

Expression D:

$D = 25^7 \times \frac{1}{1024} \times 81^5 \times 2$

Here, simplify $25^7, 81^5$, and perform the multiplications with $\frac{1}{1024}$ and 2.

Would you like me to solve each step-by-step for clarity, or do you want the final results directly? Let me know!