1/3+1/15+1/35+...+1/9999的简便运算.
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1/3+1/15+1/35+...+1/9999的简便运算.
![1/3+1/15+1/35+...+1/9999的简便运算.](/uploads/image/z/7343624-56-4.jpg?t=1%2F3%2B1%2F15%2B1%2F35%2B...%2B1%2F9999%E7%9A%84%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97.)
=1/1*3+1/3*5+1/5*7+1/99*101
=1/2*(1-1/3)+1/2*(1/3-1/5)+1/2*(1/5-1/7)+……+1/2*(1/99-1/101)
=1/2*(1-1/3+1/3-1/5+1/5-1/7+……+1/99-1/101)
=1/2*(1-1/101)
=50/101
=1/2*(1-1/3)+1/2*(1/3-1/5)+1/2*(1/5-1/7)+……+1/2*(1/99-1/101)
=1/2*(1-1/3+1/3-1/5+1/5-1/7+……+1/99-1/101)
=1/2*(1-1/101)
=50/101