limn(1/(1+n^2)+2/(2^2+n^2)+...+n/(n^2+n^2),n趋于无穷
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limn(1/(1+n^2)+2/(2^2+n^2)+...+n/(n^2+n^2),n趋于无穷
n(1/(1+n^2)+2/(2^2+n^2)+...+n/(n^2+n^2)在答案变形成n/n^2(1/((1/n)^2+1)+1/((2/n)^2+1)+...+1/((n/n)^2+1)我不太明白是怎么回事,
n(1/(1+n^2)+2/(2^2+n^2)+...+n/(n^2+n^2)在答案变形成n/n^2(1/((1/n)^2+1)+1/((2/n)^2+1)+...+1/((n/n)^2+1)我不太明白是怎么回事,
![limn(1/(1+n^2)+2/(2^2+n^2)+...+n/(n^2+n^2),n趋于无穷](/uploads/image/z/19520770-58-0.jpg?t=limn%281%2F%281%2Bn%5E2%29%2B2%2F%282%5E2%2Bn%5E2%29%2B...%2Bn%2F%28n%5E2%2Bn%5E2%29%2Cn%E8%B6%8B%E4%BA%8E%E6%97%A0%E7%A9%B7)
就是提出分母的n^2
再问: 我知道是提出分母,我只要不明白分子咋变成一的呢?正常提分母分子应该变成2^2/n^2呀
再答: n^2/n^2=1 (2^2+n^2)=n^2(2^2/n^2+1)=n^2((2/n)^2+1)
再问: 我知道是提出分母,我只要不明白分子咋变成一的呢?正常提分母分子应该变成2^2/n^2呀
再答: n^2/n^2=1 (2^2+n^2)=n^2(2^2/n^2+1)=n^2((2/n)^2+1)
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