计算1/1*3+1/3*5+1/5*7+...+1/2007+2009找规律.1.( ),18,15,( ),9,62.4/67,2/15,16/53,16/23,64/39,( ),(
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![计算1/1*3+1/3*5+1/5*7+...+1/2007+2009找规律.1.( ),18,15,( ),9,62.4/67,2/15,16/53,16/23,64/39,( ),(](/uploads/image/z/7293962-2-2.jpg?t=%26%23160%3B%26%23160%3B%E8%AE%A1%E7%AE%971%2F1%2A3%2B1%2F3%2A5%2B1%2F5%2A7%2B...%2B1%2F2007%2B2009%E6%89%BE%E8%A7%84%E5%BE%8B.1.%28%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B+%29%2C18%2C15%2C%28%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B+%29%2C9%2C62.4%2F67%2C2%2F15%2C16%2F53%2C16%2F23%2C64%2F39%2C%28%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B+%29%2C%28%26%231)
计算1/1*3+1/3*5+1/5*7+...+1/2007+2009找规律.1.( ),18,15,( ),9,62.4/67,2/15,16/53,16/23,64/39,( ),(
计算
1/1*3+1/3*5+1/5*7+...+1/2007+2009
找规律.
1.( ),18,15,( ),9,6
2.4/67,2/15,16/53,16/23,64/39,( ),( )
计算1/1*3+1/3*5+1/5*7+...+1/2007+2009找规律.1.( ),18,15,( ),9,62.4/67,2/15,16/53,16/23,64/39,( ),(
1/1*3+1/3*5+1/5*7+...+1/2007+2009 =[1-1/3+1/3-1/5+1/5-1/7+.+1/2007-1/2009]/2 =(1-1/2009)/2 =1004/2009 找规律.1.( 21 ),18,15,( 12 ),9,6 2.4/67,2/15,16/53,16/23,64/39,( 4 ),( 256/25 )