题目内容

算一算。
(1)++ (2)-+ (3)++ (4)--
(5)-(- (6)-(- (7)+(- (8)-(+
(1)原式=+
                =
(2)原式=+
                =
(3)原式=+
                =
(4)原式=-(+
                =
(5)原式=-
                =
(6)原式=-
                =
(7)原式=+
                =
(8)原式=-
                =
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