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首先,第一個是正數,第二個是負數,以此類推,第七個應是正數. 觀察分子,是1,2,3,4.所以第七個應是7. 再觀察分母,是2,5,10,17.2+3是5 5+5是10 10+7是17,所以加的數依次是3,5,7,9,11,13. 那麼第七個數是50分之7.
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