65+63+61+59+.+7+5+3+1如何巧算项数33是数出来的,还是算出来的,(65+1)/2,那么如果65+63+61+59+.+9+7+5的项数怎么算啊?
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![65+63+61+59+.+7+5+3+1如何巧算项数33是数出来的,还是算出来的,(65+1)/2,那么如果65+63+61+59+.+9+7+5的项数怎么算啊?](/uploads/image/z/624459-3-9.jpg?t=65%2B63%2B61%2B59%2B.%2B7%2B5%2B3%2B1%E5%A6%82%E4%BD%95%E5%B7%A7%E7%AE%97%E9%A1%B9%E6%95%B033%E6%98%AF%E6%95%B0%E5%87%BA%E6%9D%A5%E7%9A%84%2C%E8%BF%98%E6%98%AF%E7%AE%97%E5%87%BA%E6%9D%A5%E7%9A%84%2C%EF%BC%8865%2B1%EF%BC%89%2F2%2C%E9%82%A3%E4%B9%88%E5%A6%82%E6%9E%9C65%2B63%2B61%2B59%2B.%2B9%2B7%2B5%E7%9A%84%E9%A1%B9%E6%95%B0%E6%80%8E%E4%B9%88%E7%AE%97%E5%95%8A%3F)
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