6、极限运算法则 设 lim a=A, lim b=B,则 n→00 n→00 (1)lim(an±bn)=A±B; n→>00 2) lim a·bn=A·B; n n n→0 (3)lim ,其中B≠0. n→0 h B6、极限运算法则 (3) lim , 0. (2) lim ; (1) lim( ) ; lim ,lim , =   =   =  = = → → → → → B B A b a a b A B a b A B a A b B n n n n n n n n n n n n n 其 中 设 则