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        1. 計算:(每小題6分,共24分)
          (1)   
          (2)   
          (3)   
          (4)   

          (1)
          (2)-16
          (3)-49
          (4)-19

          (1) 解:原式····································································· 1分
          ································································ 2分
          ··········································································· 4分
          ·················································································· 6分
          (2) 解:原式························································· 1分
          ······························································ 4分
          ·········································································· 5分
          ················································································ 6分
          (3) 解:原式·························································· 3分
          ······································································ 4分
          ················································································ 6分
          (4) 解:原式···················································· 2分
          ······························································ 3分
          ····································································· 4分
          ··········································································· 5分
          ··············································································· 6分
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