Question

calcule x + 1 - x - 1
x - 1 x + 1
1 + 1
x + 1 x - 1​

Answer 1

Vamos là.

(x + 1)/(x - 1) - (x - 1)/(x + 1) = 1/(x + 1) + 1/(x - 1)

(x² + 2x + 1 - x² + 2x - 1)/(x² - 1) = (x - 1 + x + 1)/(x² - 1)

4x/(x² - 1) = 2x/(x² - 1)

4x = 2x

4x - 2x = 0

2x = 0

x = 0