作业帮1/3×5+1/5×7+1/7×9.+1/2011×2013Peasa快点,明天要交
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1/3×5+1/5×7+1/7×9.+1/2011×2013Peasa快点,明天要交
1/3×5+1/5×7+1/7×9.+1/2011×2013
Peasa快点,明天要交
1/3×5+1/5×7+1/7×9.+1/2011×2013Peasa快点,明天要交
1/3×5+1/5×7+1/7×9.+1/2011×2013
=1/2[(1/3-1/5)+(1/5-1/7)+(1/7-1/9)+……+(1/2011-1/2013)]
=1/2(1/3-1/2013)
=1/2*670/2013
=335/2013
1,3,5,7,9.
1+3+5+7+9.+99=
-1+3-5+7-9.-97+99
1+3+5+7+9.+399=?
1-3+5-7+9.+97-99
1+3+5+7+9.+9999=?
1+3+5+7+9.+1001
1/1*3*5+1/3*5*7+1/5*7*9.+1/95*97*99
1/1×3+1/3×5+1/5×7+1/7×9.+1/2011×2013
1/3*5+1/5*7+1/7*9.+1/2009*2011
1+3+5+7+9.+(2n-1)怎么做
1+3+5+7+9.+2n-1=
1/1×3+1/3×5+1/5×7+1/7×9.+1/2010×2012= 怎么算 求方法
猜想数列1/1×3,-1/3×5,1/5×7,.-1/7×9..的通项公式是,
1,-3,5,-7,9.的通项公式是多少?
-1+3-5+7-9..-97+99=?
1+3+5+7+9.+2009+2011=?
1+3+5+7+9.+95+97+99=?