Gordon Huang
11/08/2023 · Junior High School
Si \( U=\frac{2 z+\frac{z^{3}}{8}}{3 z} \) y \( z^{1 / 3}=2 \)
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Step-by-step Solution
Para resolver la expresión \( U=\frac{2 z+\frac{z^{3}}{8}}{3 z} \) dado que \( z^{1/3}=2 \), primero necesitamos encontrar el valor de \( z \).
Dado que \( z^{1/3} = 2 \), elevamos ambos lados al cubo:
\[
z = 2^3 = 8.
\]
Ahora que tenemos el valor de \( z \), sustituimos \( z = 8 \) en la expresión de \( U \):
\[
U = \frac{2(8) + \frac{(8)^{3}}{8}}{3(8)}.
\]
Calculamos cada parte:
1. \( 2(8) = 16 \).
2. \( (8)^{3} = 512 \), por lo que \( \frac{(8)^{3}}{8} = \frac{512}{8} = 64 \).
3. Entonces, \( 2(8) + \frac{(8)^{3}}{8} = 16 + 64 = 80 \).
4. Finalmente, \( 3(8) = 24 \).
Sustituyendo estos valores en \( U \):
\[
U = \frac{80}{24}.
\]
Simplificamos la fracción:
\[
U = \frac{80 \div 8}{24 \div 8} = \frac{10}{3}.
\]
Por lo tanto, el valor de \( U \) es:
\[
\boxed{\frac{10}{3}}.
\]
Quick Answer
El valor de \( U \) es \( \frac{10}{3} \).
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