题目内容

.计算:
(1)             (2)
(3)                            (4) 
                     (6)

(1)             (2)
=" "                                     =" " 5
(3)                      (4) 
="  " 3                                    =" " -6
                 (6)
=" " 1                                      =" " 3+解析:
p;【解析】略
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