计算:(每小题6分,共24分)(1) (2) (
1个回答

(1)

(2)-16

(3)-49

(4)-19

(1) 原式

····································································· 1分

································································ 2分

··········································································· 4分

·················································································· 6分

(2) 原式

························································· 1分

······························································ 4分

·········································································· 5分

················································································ 6分

(3) 原式

·························································· 3分

······································································ 4分

················································································ 6分

(4) 原式

···················································· 2分

······························································ 3分

····································································· 4分

··········································································· 5分

··············································································· 6分