题目内容
(6分) 已知：
．
试化简：
．
．试化简：
．
解：∵c3 < 0，
∴c < 0
∵b =" –" c，
∴b > 0，
∵abc > 0，
∴a < 0
∴
·············································· 3分∴原式
················································································· 6分
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