1 / 2 x + 1 / 3 x + 1 / 6 x - 1 x = → le aduc la acelasi numitor comun 6 x
= 3 / 6 x + 2 / 6 x + 1 / 6 x - 6 x² / 6 x =
= ( 6 - 6 x² ) 6 x =
= 6 ( 1 - x² ) / 6 x =
= ( 1 - x² ) / x =
= ( 1 - x ) ( 1 + x ) / x
___________________
1 / 2 x + 1 / 3 x + 1 / 6 x - 1 / x =
3 / 6 x + 2 / 6 x + 1 / 6 x - 6 / 6 x =
= ( 6 - 6 ) / 6 x = 0 / 6 x = 0
