lim(x趋于无穷大)(x^2+1/x+1 -ax-b)=0求a b
问题描述:
lim(x趋于无穷大)(x^2+1/x+1 -ax-b)=0求a b
答
∵ lim(x->∞)(x^2+1)/(x+1) -ax-b = 0∴ 0=lim(x->∞)[(x^2+1)/(x+1) -ax-b ] / x =lim(x->∞)[(x+1/x)/(x+1) -a-b/x=lim(x->∞)[(1+1/x^2)/(1+1/x) -a-b/x= 1 - a - 0 = 1-a∴ a = 1∴ lim(x->∞)(x^2+1...