1/1×5 1/5×9 1/9×13 …… 1/2013 2017=
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原式=1/5+(1/5-1/9)÷4+(1/9-1/13)÷4+...+(1/2013-1/2017)÷4
=1/5+(1/5-1/9+1/9-1/13+...+1/2013-1/2017)÷4
=1/5+(1/5-1/2017)÷4
=4/20+1/20-1/2017÷4
=1/4-1/4×1/2017
=1/4×(1-1/2017)
=1/4×2016/2017
=504/2017
=1/5+(1/5-1/9+1/9-1/13+...+1/2013-1/2017)÷4
=1/5+(1/5-1/2017)÷4
=4/20+1/20-1/2017÷4
=1/4-1/4×1/2017
=1/4×(1-1/2017)
=1/4×2016/2017
=504/2017
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