1/1x2+1/2x3+...1/n(n-1)=98/99,n的值是多少
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1x2+2x3+3x4+4x5+.+n(n+1)+n(n+2)=?
1X2+2X3+3X4+.NX(N+1)
1X2+2X3+3X4+.NX(N+1)规律
1X2+2X3.+nx(n+1)
1 1X2+2X3+3X4.n(n+1)(n+2)/
1x2+2x3+3x4+.+n(n+1)=_____(n为自然数)
1/1X2+1/2X3+1/3X4+...+1/n(n+1)等于几?
1/1x2+1/2x3+1/3x4+...+1/n(n+1)怎么算
计算:1/1x2+1/2x3+1/3x4+.+1/(n-1)n
求Sn=1/1x2+1/2x3+1/3x4+.+1/n(n+1)
设X1~N(1,2),X2~N(0,3),X3~N(2,1),X1,X2,X3相互独立,则P{0
若1/1x2+1/2x3+.+1/nx(n+1)=98/99求n
证明:1/√(1x2)+1/√(2x3)+……+1/√(n(n+1))
1X2分之1+2x3分之1+.+n(n+1)分之一
1x2+2x3+3x4+4x5.n(n+1)等于多少?急救!
求使1x2+2x3+3x4+…+n(n+1)
1x2+2x3+3x4+...+n(n+1)=?
1x2+2x3+3x4...+10x11=?1x2+2x3+3x4...+nx(n-1)=?