x(n+1)

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x(n+1)x(n+1)x(n+1)证明:∵x(n+1)≤x(n)+1/n^2∴x(2)≤x(1)+1x(3)≤x(2)+1/2^2x(4)≤x(3)+1/3^2.x(n)≤x(n-1)+1/n^2∴

x(n+1)
x(n+1)

x(n+1)
证明:∵x(n+1)≤x(n)+1/n^2
∴x(2)≤x(1)+1
x(3)≤x(2)+1/2^2
x(4)≤x(3)+1/3^2
.
x(n)≤x(n-1)+1/n^2
∴x(2)+x(3)+x(4)+.+x(n)≤x(1)+x(2)+x(3)+.+x(n-1)+1+1/2^2+1/3^2+.+1/n^2
==>x(n)≤x(1)+1+1/2^2+1/3^2+.+1/n^2
∵1+1/2^2+1/3^2+.+1/n^2收验
∴x(1)+1+1/2^2+1/3^2+.+1/n^2收验
∴x(n)收验
故数列{x(n)}收敛.