x+2x+3x+.+100x

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x+2x+3x+.+100xx+2x+3x+.+100xx+2x+3x+.+100x原式=（1+2+3+.+99+100）*X=[（1+100）*100/2]*X=5050X第一步到第二步是求和公式,

x+2x+3x+.+100x
x+2x+3x+.+100x

x+2x+3x+.+100x
原式=（1+2+3+.+99+100）*X
=[（1+100）*100/2]*X
=5050X
第一步到第二步是求和公式,（首项+末项）*项数/2

假设x=1，结果为5050

x+2x+3x+.+100x *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || x(x*x-6x-9)-x(x*x-8x-15)+2x(3-x) 填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x 七年级下册政治复习提纲(山东人民出版社)第五单元是青春的脚步青春的气息别弄错了啊!格式：X X X X X X X X X 1、X X X X X X X X X X.2、X X X X X X X X X.3、X X X X X X X X X X X. x-2x+3x-4x+5x.+99x-100x=25求解 2x+3x+4x+5x+x+6x+7x=100 x(x-2)(x-3) {x|(x+3)(x-2) -x^3+x^2-x x×x+3x-9/ x+2 (x*x-3)*(x*x-3)-x*(x*x-3)-2x*x 因式分解（X+X)+(X-X)+(X*X)+(X/X)=100 化简 x+2x+3x+...+100x (x+2x+3x+.100x )化简 1/(x+1)(x+2)+1/(x+2)(x+3)+1/(x+3)(x+4)+...+1/(x+100)(x+101) 1/X(X+1)+1/(X+1)(X+2)+1/(X+2)(X+3).+1/(X+99)(X+100)= 解方程：2x+4x+6x...+100x=1-(x+3x+5x+...+99x)