2) lim f() 0的情形.取常数k≠0, x-→aF(x) 得- x→☑ F(x) lim f(x)+kF(x) F(x) =k≠0,可用1)中结论 x→a lim J(x)+kF(x) lim x-→a F'(x) f(x) lim =lim f(x) x-→aF(x)x-aF'(x) Oo⊙@82) 0 ( ) ( ) lim = → F x f x x a 的情形. 取常数 k 0 , = k 0, + → k F x f x x a ( ) ( ) lim ( ) ( ) ( ) lim F x f x kF x x a + = → ( ) ( ) ( ) lim F x f x kF x x a + → ( ) ( ) ( ) lim F x f x kF x x a + = → + = → k F x f x x a ( ) ( ) lim ( ) ( ) lim ( ) ( ) lim F x f x F x f x x a x a = → → 可用 1) 中结论 机动 目录 上页 下页 返回 结束