求极限lim [ 2^(n+1)+3^(n+1)]/2^n+3^n (n→∞)
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求极限lim [ 2^(n+1)+3^(n+1)]/2^n+3^n (n→∞)
[ 2^(n+1)+3^(n+1)]/[2^n+3^n]
=[2*2^n+3*3^2]/[2^n+3^n]=[2*2^n+2*3^2+3^n]/[2^n+3^n]=2+3^n/[2^n+3^n]lim 2+1/[1+(2/3)^n]=3
再问: ��һ���������=[2*2^n+3*3^n]/[2^n+3^n]=[Ȼ���û����
再答: ��2^n ������a,3^n������b (2a+3b)/(a+b) =(2a+2b+b)/(a+b) =2+b/(a+b) =2+1/(1+a/b) a/b=2^n/3^n ��n���������ʱ ��������0 ���Ծ���2+1=3
=[2*2^n+3*3^2]/[2^n+3^n]=[2*2^n+2*3^2+3^n]/[2^n+3^n]=2+3^n/[2^n+3^n]lim 2+1/[1+(2/3)^n]=3
再问: ��һ���������=[2*2^n+3*3^n]/[2^n+3^n]=[Ȼ���û����
再答: ��2^n ������a,3^n������b (2a+3b)/(a+b) =(2a+2b+b)/(a+b) =2+b/(a+b) =2+1/(1+a/b) a/b=2^n/3^n ��n���������ʱ ��������0 ���Ծ���2+1=3
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