已知1※3=1x2x3,4※5=4x5x6x7x8,请计算(6※4)/(3※4)并写出计算过程及怎计算,

已知1※3=1x2x3,4※5=4x5x6x7x8,请计算(6※4)/(3※4)并写出计算过程及怎计算, 已知1△3=1X2X3,6△5=6X7X8X9X10,求2△5. 已知1△3=1X2X3,6△5=6X7X8X9X10,求2△5. 1/(1x2)+2/(1x2x3)+3/(1x2x3x4)+4/(1x2x3x4x5)+.+9/(1x2x3x4x5x6x7x8x9x10)=? 请1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6= 1x2x3+2x3x4+3x4x5+4x5x6+...+n(n+1)(n+2)= 2/1x2x3+2/2x3x4+2/3x4x5+2/4x5x6+...+2/98x99x100= 1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6+1/5x6x7=?这类题 解方程时能省略算式吗?如；48+52=5X5x 25x=100 x=4 1x2x3+2x3x4+3x4x5+...+7x8x9=, 1x2X3+2x3X4+3x4X5+…+7X8X9=? 1x2x3+2x3x4+...+nxx=? 1x2x3……x100= 已知x1、x2……xn是实数,x1+x2+……+xn=0,求证不等式x1x2+x2x3+x3x4+……+xn-1x1≤0在n=3,4时成立；n≥5时不成立 如果2()3=2X3X4,4()2=4X2X3计算6()3=?5()2=?(1()2)()3=? 5x+2=-8 x=30 3x=5x-14 x5x+2=-8x=303x=5x-14x=-7/47-2x=3-4xx=-5/31/2x+1=3-xx=-2 1x2=1|3(1x2x3-0x1x2) 2x3=1|3(2x3x4-1x2x3) 3x4=1|3(3x4x5-2x3x4)由此推断1x2x3+2x3x4+3x4x5.7x8x9=? 1x2=1/3x(1x2x3-0x1x2)2x3=1/3x(2x3x4-1x2x3)3x4=1/3x(3x4x5-2x3x4)求1x2x3+2x3x4+3x4x5+...+7x8x9=?