指教1×1/3×1/5+1/3×1/5×1/7+.+1/195×1/197×1/199等于多少,

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指教1×1/3×1/5+1/3×1/5×1/7+.+1/195×1/197×1/199等于多少,
指教1×1/3×1/5+1/3×1/5×1/7+.+1/195×1/197×1/199等于多少,

指教1×1/3×1/5+1/3×1/5×1/7+.+1/195×1/197×1/199等于多少,
=1/4×(1/1×3-1/3×5+1/3×5-1/5×7+……+1/195×197-1/197×199)
=1/4×(1/1×3-1/197×199)
=9800/117609