1/(3×5)+1/(5×7)+1/(7×9)+...+1/(97×99)的结果
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原式
= 1/2×(1/3-1/5) +1/2×(1/5-1/7) +1/2×(1/7-1/9)+.+1/2×(1/97-1/99)
= 1/2×(1/3-1/5+1/5-1/7+1/7-1/9+.+1/97-1/99)
= 1/2×(1/3-1/99)
= 1/2×32/99
= 16/99
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梳理知识,帮助别人,愉悦自己.
“数理无限”团队欢迎你
= 1/2×(1/3-1/5) +1/2×(1/5-1/7) +1/2×(1/7-1/9)+.+1/2×(1/97-1/99)
= 1/2×(1/3-1/5+1/5-1/7+1/7-1/9+.+1/97-1/99)
= 1/2×(1/3-1/99)
= 1/2×32/99
= 16/99
--------------------
梳理知识,帮助别人,愉悦自己.
“数理无限”团队欢迎你
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