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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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