1)li f()≠0的情形 型 x→aF(x) 0 -1 lim f(x) lim F(x) F2(x) F'(x) xa F(x) lim x→a 1 x→a -1 f'(x) f(x) f2(x) 8- lim F'(x) xa f'(x) 1=limf.1im F'(x) xaF(x)xa f(x) 从而 lim f() limf(x) x→aF(x) xa F(x) Ooo⊙o8 1) 0 ( ) ( ) lim  → F x f x x a 的情形 ( ) ( ) lim F x f x x→a lim x→a = ( ) 1 F x ( ) 1 f x lim x→a = ( ) ( ) 1 2 F x F x  − ( ) ( ) 1 2 f x f x  −               = → ( ) ( ) ( ) ( ) lim 2 f x F x F x f x x a ( ) ( ) lim ( ) ( ) lim 2 f x F x F x f x x a x a         = → → ( ) ( ) lim ( ) ( ) 1 lim f x F x F x f x x a x a    =  → → ( ) ( ) lim ( ) ( ) lim F x f x F x f x x a x a   = → → 从而 型 0 0 机动 目录 上页 下页 返回 结束