X7+X5+1怎么化简?
59x7/58+57x5/58简便算法怎么做
x8+x7+x6+x5+x4+x3+x2+x+1因式分解
1X3分之一+3X5分之一+5X7分之一+7X9分之一加到2009X2011分之一怎么算,
1/1X3+1/3X5+1/5X7...1/17X19+1/19X21=
1/1x3+1/3x5+1/5x7.1/2009x2010+1/2011x2013
1/1x3+1/3x5+1/5x7+1/7x9+1/9x11=?
计算:1/1x3+1/3x5+1/5x7+...1/2009x2011+1/2011×2013
1/1x3+1/3x5+1/5x7+……+1/99x101
1/1x3+1/3x5+1/5x7+…+1/2011x2013是多少?
1/(1x3)+1/(3x5)+1/(5x7)+.+1/(2011x2013) 等于什么
1/1x3+1/3x5+1/5x7+.+1/2009x2011=
1/1x3+1/3x5+1/5x7+.+1/1997x1999 简便计算.