1/1X3+1/3X5+…….+1/99X101
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1/1X3+1/3X5+…….+1/99X1011/1X3+1/3X5+…….+1/99X1011/1X3+1/3X5+…….+1/99X1011/1X3+1/3X5+…….+1/99X101=1/2
1/1X3+1/3X5+…….+1/99X101
1/1X3+1/3X5+…….+1/99X101
1/1X3+1/3X5+…….+1/99X101
1/1X3+1/3X5+…….+1/99X101
=1/2(1-1/3)+1/2(1/3-1/5)+…….+1/2(1/99-1/101)
=1/2(1-1/3+1/3-1/5+……+1/99-1/101)
=1/2(1-1/101)
=1/2*100/101
=50/101
=1/2(1-1/3+1/3-1/5+1/5-1/7....1/99-1/101)
=1/2(1-1/101)
=50/101
约分啊
最后为101
1/(1×3)+1/(3×5)+···+1/(99×101)
=(1-(1/3))/2+((1/3)-(1/5))/2+···+((1/99)-(1/101))/2
=(1-(1/3)+(1/3)-(1/5)+···+(1/99)-(1/101))/2
=(1-(1/101))/2
=50/101
=1/2(1-1/3+1/3-1/5+1/5-……-1/99+1/99-1/101)
=1/2(1-1/101)
=50/101
1-2/3+2/3-3/5+.......+50/99-51/101=1-51/101=50/101
答案是50/101
因式分解：x5+x3+1
计算1x3+3x5+5x7+…+97x99
1x5+2x5+3x5+4x5+5x5… 麻烦给我一个公式.
1/1X3+1/3X5+…….+1/99X101
计算1／1x3+1/3x5+1/5x7+…+1/99x101的值
1/1X3 +1/3x5+1/5x7……+1/2013x2015=?
计算1/1x3+1/2x4+1/3x5+……+1/9x11=?
1/1x3+1/3x5+1/5x7+……1/97x99=
1/1X3+1/2X4+1/3X5……+1/9X11=?,
1x3/1+3x5/1+5x7/1+……+17x19/1
1/1x3+1/2x4+1/3x5+……+1/18x20=?
1x2/1+2x3/1+3x4/1+4x5/1+…+39x40/1
1/1x3+1/3x5+1/5x7+…+1/2011x2013是多少?
1/1x3+1/3x5+1/5x7+…+1/2009x2011 急
解一道方程组x1+x2+x3=5,x2+x3+x4=1,x3+x4+x5=-5,x4+x5+x1=-3,x5+x1+x2=2
1X3分之一+3X5分之一+5X7分之一……+49X51分之一
1x3＋2x4＋3x5＋…9x11
x5-x4+x3-x2+x-1因式分解