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计算 -42+(7-9)3÷

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102,87,100,79,82,62,84,42,22,12,68  102,100,87,84,82,79,68,62,42,22,12  12,22,42,62,68,79,82,84,87,100,102  102,87,42,79,82,62,68,100,84,12,22  
35  42  68  79  
151,87,123,79,82,62,84,42,31,17,68  151,123,87,84,82,79,68,62,42,31,17  17,31,42,62,68,79,82,84,87,123,151  151,87,42,79,82,62,68,123,84,17,31  
(102,87,100,79,82,62,84,42,22,12,68)  (102,100,87,84,82,79,68,62,42,22,12)  (12,22,42,62,68,79,82,84,87,100,102)  (102,87,42,79,82,62,68,100,84,12,22)  

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