对分子有理化 则括号内变为(kn-3)/(2n+√(4n^2-kn+3)),分子分母都除以n,变为(k-3/n)/(2+√(4-k/n+3/n^2)),所以k/4=1,k=4
lim(2n-√(4n^2-kn+3))=1 则k的值 则么求?
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