計(jì)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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