Question

Se 1 - 4/x + 4/x² = 0, então 2/x vale ? (Obs: as "/" significa fração)

Answer 1

1 - 4/x + 4/x² =0   mmc=x²

x² - 4x + 4 = 0   fazendo baskara achamos as raizes x'=2, x"=2

entao 2/x = 2/2 = 1