小结:1.设fx)=ay+a1yn-1+…+an:则有 lim f(x=ao(lim x)+a,(lim x)+.+a x→>ro x→xo x→x =p0a1-01 +…+anf(x0 P 2设∫(x) (x),且Q(xo)≠0,则有 o(c) lim P(x) P(xo) lim f(x) x→>x0 lim e(x)2(ro) f(x0) x→>x0 x→x0 若Q(xo=0,则商的法则不能应用小结: 1. 设f(x)=a0x n+a1x n−1+...+an ,则有 n n x x n x x x x f x = a x + a x + + a − → → → lim ( ) 0 (lim ) 1 (lim ) 1  0 0 0 =a0x0 n+a1x0 n−1+...+an =f(x0 ) 2.设 ( ) ( ) ( ) Q x P x f x = ,且Q(x0 )0,则有 lim ( ) lim ( ) lim ( ) 0 0 0 Q x P x f x x x x x x x → → → = ( ) ( ) 0 0 Q x P x = =f(x0 ) 若Q(x0 )=0,则商的法则不能应用