题目内容

计算:
(1)
(2)
(3)
(4)
(5)
(6)
解:(1)原式=
                       =
                       =
(2)原式=
                =
(3)原式=
                =
(4)原式=
                =
                =
(5)原式=
                =
(6)原式=
                =
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