题目内容
计算：（每小题6分，共24分）
(1)
(2)
(3)
(4)
(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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