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关于根式的数列1/(2√1+√2)+1/(3√2+2√3)1/(4√3+3√4)……+1/100√99+99√100
题目详情
关于根式的数列
1/(2√1+√2)+1/(3√2+2√3)1/(4√3+3√4)……+1/100√99+99√100
1/(2√1+√2)+1/(3√2+2√3)1/(4√3+3√4)……+1/100√99+99√100
▼优质解答
答案和解析
1/[(n+1)√n+n√(n+1)]
=[(n+1)√n+n√(n+1)]/[(n+1)^2*n-n^2*(n+1)]
=[(n+1)√n+n√(n+1)]/[n(n+1)]
=1/√n - 1/√(n+1)
所以结果为9/10
=[(n+1)√n+n√(n+1)]/[(n+1)^2*n-n^2*(n+1)]
=[(n+1)√n+n√(n+1)]/[n(n+1)]
=1/√n - 1/√(n+1)
所以结果为9/10
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