2)lim f(x 0的情形.取常数k≠0 x>a F(x) lim( f(x)+k= lim f(x)+kF() xX→)a F(x) x→aF(x) lim f(x)+kF(x) k≠0,可用1)中结论 x→a F() lim/(x)+kF(x) lim f(x+k x→a F(x)x→LF'(x) lim (x)=lim f(x) x→>aF(x)x→xaF(x) HIGH EDUCATION PRESS 0 机动 上页下页返回结味2) 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