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


			
          

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

          (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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