作业帮1/1x2x3+1/2x3x4+1/3x4x5+.+1/8x9x10 求简算
来源：学生作业帮助网 编辑：作业帮 时间：2024/10/09 12:20:42
xPKN0JTϿ(n &4EDn9@nQ= .inXz&&@a
<6r"ҍi fݴ[H5GȚAro: w I<ȗ꜐<̋*/e :[0)g9/-S>䗊!ДcmfsTQ4JK0ђKU}"$x )8
>sK8Vh%=ɋ;/XeBS㭦 Q <<= E'y~Up#]w-|{kEw Z}ﾧ`t- U)+xq&Ѥ
1/1x2x3+1/2x3x4+1/3x4x5+.+1/8x9x10 求简算
1/1x2x3+1/2x3x4+1/3x4x5+.+1/8x9x10 求简算
1/1x2x3+1/2x3x4+1/3x4x5+.+1/8x9x10 求简算
1/1x2x3+1/2x3x4+1/3x4x5+......+1/8x9x10
=1/2 [1/1×2-1/2×3＋1/2×3-1/3×4＋1/3×4-1/4×5＋。。。＋1/8×9-1/9×10]
=1/2[1/2-1/90]
=1/2×44/90
=11/45
1x2x3+2x3x4+...+nxx=?
1x2=1/3x(1x2x3-0x1x2)2x3=1/3x(2x3x4-1x2x3)3x4=1/3x(3x4x5-2x3x4)求1x2x3+2x3x4+3x4x5+...+7x8x9=?
1x2x3+2x3x4+3x4x5+…+8x9x10
1x2x3+2x3x4+3x4x5+.+10x11x12
1x2x3+2x3x4+3x4x5+...+7x8x9=,
1x2X3+2x3X4+3x4X5+…+7X8X9=?
1x2x3 2x3x4 3x4x5 .10x11x12,怎么算
求和：1X2X3+2X3X4+3X4X5+...+98X99X100
1/1x2x3+1/2x3x4+.+1/98x99x100 .
1/1X2X3+1/2X3x4+…+1/48X49X50
1X2X3+2X3X4+.+n(n+1)(n+2)
1x2x3+2x3x4+.+nx(n+1)(n+2)=?
1x2x3+2x3x4+.+n(n+1)(n+2)=?
求和1x2x3+2x3x4+...+n(n+1)(n+2)
1x2x3+2x3x4+…+n(n+1)
计算1x2x3+2x3x4+…+48x49x50
1x2=1|3(1x2x3-0x1x2) 2x3=1|3(2x3x4-1x2x3) 3x4=1|3(3x4x5-2x3x4)由此推断1x2x3+2x3x4+3x4x5.7x8x9=?
1/1x2x3+1/2x3x4+1/3x4x51/2x3x4 + 1/3x4x5 + 1/4x5x6 +……+1/99x100x101是 1/（2x3x4）