请1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6=
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请1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6=请1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6=请1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6==
请1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6=
请1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6=
请1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6=
=1/2×(1/1×2-1/2×3+1/2×3-1/3×4+1/3×4-1/4×5+1/4×5-1/5×6)
=1/2×(1/1×2-1/5×6)
=7/30
6+6+20/3+30/4=157/6
1x2x3+2x3x4+...+nxx=?
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
请1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6=
1x2x3+2x3x4+3x4x5……+10x11x12巧算 请在两天之内回答
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=?