微积分,麻烦帮我看看第100和101应该是同一个思路,但我不会?_百度...
发布网友
发布时间:2024-10-20 16:28
我来回答
共2个回答
热心网友
时间:2024-12-01 02:59
100) ln(1+x) ~ x
展开得:(n^2)(1/n - 1/(n+1)) = 1, as n->oo
101) arctan x ~ x
展开得:n^2(pi/n - pi/(n+1)) = pi, as n->oo
热心网友
时间:2024-12-01 03:03
100还可以与直接暴力解
=limn²ln((n+1)²/n(n+2))
=limn²ln(1+1/(n²+2n))
=limn²/(n²+2n)
=1
热心网友
时间:2024-12-01 03:04
100) ln(1+x) ~ x
展开得:(n^2)(1/n - 1/(n+1)) = 1, as n->oo
101) arctan x ~ x
展开得:n^2(pi/n - pi/(n+1)) = pi, as n->oo
热心网友
时间:2024-12-01 02:55
100还可以与直接暴力解
=limn²ln((n+1)²/n(n+2))
=limn²ln(1+1/(n²+2n))
=limn²/(n²+2n)
=1