两个数的倒数和是12分之7,这两个数分别是( )和( )两根同样长的绳子,第一根剪掉了2分之1米,第二根剪掉了2分之1,那一根剪下的多?为什么?1×3分之1 + 3×5分之1 + 5×7分之1 +……+ 17×19分之1 +
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![两个数的倒数和是12分之7,这两个数分别是( )和( )两根同样长的绳子,第一根剪掉了2分之1米,第二根剪掉了2分之1,那一根剪下的多?为什么?1×3分之1 + 3×5分之1 + 5×7分之1 +……+ 17×19分之1 +](/uploads/image/z/801543-39-3.jpg?t=%E4%B8%A4%E4%B8%AA%E6%95%B0%E7%9A%84%E5%80%92%E6%95%B0%E5%92%8C%E6%98%AF12%E5%88%86%E4%B9%8B7%2C%E8%BF%99%E4%B8%A4%E4%B8%AA%E6%95%B0%E5%88%86%E5%88%AB%E6%98%AF%EF%BC%88+%EF%BC%89%E5%92%8C%EF%BC%88+%EF%BC%89%E4%B8%A4%E6%A0%B9%E5%90%8C%E6%A0%B7%E9%95%BF%E7%9A%84%E7%BB%B3%E5%AD%90%2C%E7%AC%AC%E4%B8%80%E6%A0%B9%E5%89%AA%E6%8E%89%E4%BA%862%E5%88%86%E4%B9%8B1%E7%B1%B3%2C%E7%AC%AC%E4%BA%8C%E6%A0%B9%E5%89%AA%E6%8E%89%E4%BA%862%E5%88%86%E4%B9%8B1%2C%E9%82%A3%E4%B8%80%E6%A0%B9%E5%89%AA%E4%B8%8B%E7%9A%84%E5%A4%9A%3F%E4%B8%BA%E4%BB%80%E4%B9%88%3F1%C3%973%E5%88%86%E4%B9%8B1+%2B+3%C3%975%E5%88%86%E4%B9%8B1+%2B+5%C3%977%E5%88%86%E4%B9%8B1+%2B%E2%80%A6%E2%80%A6%2B+17%C3%9719%E5%88%86%E4%B9%8B1+%2B)
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