Question

x³-y³

x³+y³

Quando x = 1/2 e y = -2

O resultado é -65/63 só preciso dos cálculos

Answer 1

Explicação passo-a-passo:

$\sf E=\dfrac{x^3-y^3}{x^3+y^3}$

$\sf E=\dfrac{\left(\frac{1}{2}\right)^3-(-2)^3}{\left(\frac{1}{2}\right)^3+(-2)^3}$

$\sf E=\dfrac{\frac{1}{8}-(-8)}{\frac{1}{8}+(-8)}$

$\sf E=\dfrac{\frac{1}{8}+8}{\frac{1}{8}-8}$

$\sf E=\dfrac{\frac{1+64}{64}}{\frac{1-64}{64}}$

$\sf E=\dfrac{\frac{65}{64}}{\frac{-63}{64}}$

$\sf E=\dfrac{65}{64}\cdot\dfrac{64}{-63}$

$\boxed{\sf E=\dfrac{-65}{63}}$