数列极限的运算与性质 定理若imxn=A,imyn=B,则 n→>00 (1)lim(xn土yn)= lim x± lim y=A±B (2) lim(x ym)=lim x, lim y,=A. B; n→)0 n→00 n→00 特别imn(C·xn)= C lim x=C·A(C为常数) n→)0 limx (3)若 lim y=B≠0,则lm n→)00 n→00 Im B (lim imxn=√A,(k为偶数时,要求imxn=A≥0) n→)0 n→00 n→08 数列极限的运算与性质 lim , lim n n n n x A y B → → 定理 若 = = ,则 1 lim ) lim lim ; n n n n n n n x y x y A B → → → () ( = = 2 lim ) lim lim ; n n n n n n n x y x y A B → → → ( ) ( = = lim 3 lim , lim lim n n n n n n n n n x x A y B y y B → → → → ( )若 = = 0则 = ; 4 lim lim , ( lim . k k k n n n n n n x x A k x A → → → ( ) = = = 为偶数时,要求 0) lim ) lim ( n n n n C x C x C A C → → 特别 ( = = 为常数)