6、极限运算法则 设imf(x)=A,limg(x)=B,则 x->x0 x→>x0 (1)lim(f(x)±g(x)=A±B; x→>x0 (2)limf(x)·g(x)=A·B; x→x (3)lim f() A 其中B≠0 x→xg(x)B6、极限运算法则 , 0. ( ) ( ) (3) lim (2) lim ( ) ( ) ; (1) lim ( ( ) ( )) ; lim ( ) , lim ( ) , 0 0 0 0 0 =   =   =  = = → → → → → B B A g x f x f x g x A B f x g x A B f x A g x B x x x x x x x x x x 其 中 设 则