1*5/1+5*9/1+9*13/1+13*17/1+17*21/1
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1*5/1+5*9/1+9*13/1+13*17/1+17*21/11*5/1+5*9/1+9*13/1+13*17/1+17*21/11*5/1+5*9/1+9*13/1+13*17/1+17*21
1*5/1+5*9/1+9*13/1+13*17/1+17*21/1
1*5/1+5*9/1+9*13/1+13*17/1+17*21/1
1*5/1+5*9/1+9*13/1+13*17/1+17*21/1
1*5/1+5*9/1+9*13/1+13*17/1+17*21/1
=1/4(1-1/5)+1/4(1/5-1/9)+1/4(1/9-1/13)+1/4(1/13-1/17)+1/4(1/17-1/21)
=1/4[1-1/5+1/5-1/9+1/9-1/13+1/13-1/17+1/17-1/21]
=1/4(1-1/21)
=1/4×20/21
=5/21
1/(1×5)+1/(5×9)+1/(9×13)+1/(13×17)+1/(17×21)
=1/4×(1-1/5+1/5-1/9+1/9-1/13+1/13-1/17+1/17-1/21)
=1/4×(1-1/21)
=1/4×20/21
=5/21
1*5/1+5*9/1+9*13/1+13*17/1+17*21/1
=1/4(1-1/5)+1/4(1/5-1/9)+1/4(1/9-1/13)+1/4(1/13-1/17)+1/4(1/17-1/21)
=1/4[1-1/5+1/5-1/9+1/9-1/13+1/13-1/17+1/17-1/21]
=1/4(1-1/21)
=1/4×20/21
=5/21
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1*5/1+5*9/1+9*13/1+13*17/1+17*21/1
1/1*5+1/5*9+1/9*13+1/13*17+1/17*21
1*5/1+5*9/1+9*13/1+13*17/1+.45*49/1
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1/5*9+1/9*13+.+1/101*105
1*1/5+1/5*1/9 1*1/5+1/5*1/9+1/9*1/13+1/13*1/17 计算
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1/7*5+1/7*9+1/9*11+1/11*13+1/13*15
计算:1/3*5+1/5*7+1/7*9+1/9*11+1/11*13
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1/1*5+1/5*9+1/9*13+.+1/101*105
1/1×5+1/5×9+1/9×13+...+1/2009×2013
1×5/1+5×9/1+9×13/1+…+2009×2013/1
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1/1*5+1/5*9+1/9*13+.+1/33*37
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