1x2+2x3+...+100x101=______________
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1x2+2x3+3x4+.+100x101=
1x2+2x3+3x4+.+100x101=?结果
1x2+2x3+...+100x101=______________
3x(1x2+2x3+3x4+.+99x100+100x101)=
1/1X2+1/2X3+1/3X4...+1/100X101+101X102怎么算
解题:1X2+2X3+3X4+……+100X101
1x2十2x3十……十100x101
利用此规律计算:1x2分之1+2x3分之一+3x4分之一+...+100x101分之一+101x102分之一=?
1x2+2x3+3x4+4x5······100x101答案是几?
1x2+2x3+3x4+...+100x101 等于什么它的规律是什么?怎么用字母表示?
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101简便算法答案
1x1-2x2+3x3-4x4******+99x99-100x100+101x101的过程教教我
1x2+2x3+3x4+·······+101x101=什么
数学题目,求速度1x2十2x3+…+100x101=1x2+2x3+…+n(n十1) 1x2x3+2+3x4+…+n(n+1)(n+2)
在数列{an}满足lgxn+1=1+lgxn,且x1+x2+X3.+x100=100,则lg(x101+x102+...+x200)=
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
下面等式成立 x1x2=x2x3=.=x101x1=1,求x1,x2,x3.x100,x101的值
设数列{Xn}满足1gXn+1=1+lgXn,且X1+X2+X3.+X100=100,则lg(X101+X102+X103+...+X200)=数列{xn}满足lgx(n+1)=1+lgxn且x1+x2+x3+.x100=100则lg(x101+x102+x103+.x200)的值为