1/3×5+1/5×7+1/7×9+…1/199×201
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1/3×5+1/5×7+1/7×9+…1/199×2011/3×5+1/5×7+1/7×9+…1/199×2011/3×5+1/5×7+1/7×9+…1/199×2011/3×5=(1/3-1/5)/
1/3×5+1/5×7+1/7×9+…1/199×201
1/3×5+1/5×7+1/7×9+…1/199×201
1/3×5+1/5×7+1/7×9+…1/199×201
1/3×5=(1/3-1/5)/2
1/5×7=(1/5-1/7)/2
.
1/199×201=(1/199-1/201)/2
原式=(1/3-1/5+1/5-1/7+1/7.+1/199-1/201)/2
=(1/3-1/201)/2
=11/67
1/3*5+1/5*7+1/7*9+……1/97*99
1+3+5+7+9+……+(2n-1)
1/3×1/5+1/5×1/7+1/7×1/9+……+1/97×1/99
1+1/1*3+1/3*5+1/5*7+1/7*9+……+1/99*101=?
1/3×5+1/5×7+1/7×9+…1/199×201
1/3×5 +1/5×7 + 1/7×9 + …+ 1/99×100
1/3*5+1/5*7+1/7*9…+1/2010*2011
1/3×5 +1/5×7 + 1/7×9 + …+ 1/99×100
计算:1/1*3+1/3*5+1/5*7+1/7*9+……+1/97*99=
1/1×3+1/3×5+1/5×7+1/7×9……1/97×99算式,
1/1*3+1/3*5+1/5*7+1/7*9……+1/99*101等于多少?
1/1*3+1/3*5+1/5*7+1/7*9……1/2007*2009
1/3*5+1/5*7+1/7*9+1/9*11+……+1/2003*2005
计算1/3*1/5+1/5*1/7+1/7*1/9+1/9*1/11……1/99*1/101=?
1-3+5-7+9-11……2007-2009?
1+3+5+7+9+……+97+99是多少?
计算1-3+5-7+9……-1999+2001
计算1+3+5+7+9+……+201