100X100一99X99+98X98一97X97+,十2X2一1X1

100X100一99X99+98X98一97X97+,十2X2一1X1 100X100—99X99+98X98+...+2X2—1X1 100X100—99X99+98X98+...+2X2—1X1等于多少 100X100-99X99-98X98-97X97+…+2X2-1X1=? 计算100X100-99X99+98X98-97X97+...+2X2-1X1= 1X1+2X2+3X3+4X4+5X5.+98X98+99X99+100X100=? 100x100-99x99+98x98-97x97+.+4x4-x4-3x3+2x2-1计算 1x1一2x2十3x3一4x4十5x5…十99x99一100x100 25.60.8（ ）25.6 2.7X25.60.8（ ）25.6 2.7X99（ )2.7X100一2.7 0.25x0.25x...x0.25x4x...x4=1x2分之1+2x3分之1+3x4分之1+4x5分之1+...+97x98分之1+98x99分之1+99x100分之1=(1+2分之1）x（1+3分之1）x（1+4分之1）x...(1+18分之1）x（1+19分之1）x（1+20分之1）= 设A=1/2x3/4x5/6…x99/100,试比较A与十分之一的大小.求简单的算式.A=1/2X3/4X5/6X7/8.X99/100 假设一个数B B=2/3X4/5X6/7X8/9.X98/99 则AXB=1/100 而1/100=1/10X1/10 因为B＞A,所以B＞1/10 则A＜1/10 这个只能做个简单的判 2x4/1+4x6/1+6x8/1.+96x98/1+98x100/1= 1/1X2+1/2x3+1/3x4+1/4x5+.+1/98x99+1/99x100求结果! 求1x2,2x3,3x4,4x5,……98x99,99x100的倒数和如题 1/1x2+1/2x3+1/3x4+……+1/98x99+1/99x100=…… 2/1x2+2/2x3+2/3x4+2/4x5+...+2/98x99+2/99x100 1x2+2x3+3x4+4x5+······98x99+99x100=? 1/1x2+1/2x3+1/3x4+.1/98x99+1/99x100=?要注明运算过程