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每一個數都用一減,之後的數的和就是一個等比數列求和了,就可以算了啊. 一共8個數,就是用8減去二分之一加四分之一加八分之一加十六分之一.後面的求和用等比數列求和公式=256分之255.再用8減一下就算出來了
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