Simplify the following expressions involving exponents: 1) 20100 ext / 20100, 2) racx32x3, 3) (-2xyz)0, 4) rac(2a5b3)3 (2a2b4)232a19b17

$$20^0 = 1$$

The simplified expression is $\boxed{1}$.

2) Simplify $\frac{x^3}{2x^3}$.

$$\frac{1}{2} \times 1 = \frac{1}{2}$$

The simplified expression is $\boxed{\frac{1}{2}}$.

3) Simplify $(-2xyz)^0$.

Since the entire expression $(-2xyz)$ is raised to the power of 0, the result is 1.

$$(-2xyz)^0 = 1$$

The simplified expression is $\boxed{1}$.

4) Simplify $\frac{(2a^5b^3)^3 (2a^2b^4)^2}{32a^{19}b^{17}}$.

Apply $(xy)^n = x^n y^n$ and $(x^m)^n = x^{mn}$.

$$(2a^5b^3)^3 = 2^3 (a^5)^3 (b^3)^3 = 8a^{15}b^9$$

Apply $(xy)^n = x^n y^n$ and $(x^m)^n = x^{mn}$.

$$(2a^2b^4)^2 = 2^2 (a^2)^2 (b^4)^2 = 4a^4b^8$$

$$(8a^{15}b^9)(4a^4b^8) = (8 \times 4)(a^{15}a^4)(b^9b^8)$$

Apply $a^m a^n = a^{m+n}$.

$$32a^{15+4}b^{9+8} = 32a^{19}b^{17}$$

Since the numerator and denominator are identical, the expression simplifies to 1.

$$\frac{32a^{19}b^{17}}{32a^{19}b^{17}} = 1$$

The simplified expression is $\boxed{1}$.

5) Simplify $\left(\frac{2^{12}a^2vfq^2w^2er}{csd^9f^{10}q^3}\right)^0$.

Since the entire fraction inside the parentheses is raised to the power of 0, the result is 1.

$$\left(\frac{2^{12}a^2vfq^2w^2er}{csd^9f^{10}q^3}\right)^0 = 1$$

The simplified expression is $\boxed{1}$.