Răspuns:
Explicație pas cu pas:
a)
x² + x = x (x + 1)
x² - x = x (x - 1) sau (x - √x)(x + √x)
x³ - x = x (x² - 1) = x (x - 1)(x + 1)
b)
x² + x / x² - x =
x(x + 1) / x(x - 1) =
x + 1 / x - 1
x² - x / x³ - x =
x(x - 1) / x (x - 1)(x + 1) =
1 / (x + 1)
x³ - x / x² + x =
x (x² - 1) / x (x + 1) =
x (x + 1)(x - 1) / x (x + 1) =
x - 1
#copaceibrainly
