，其中
．
··························································································· 1分
···························································································· 3分
······························································································································· 4分
時，原式=
． 6分
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總有（ �。�
，其中
滿足x2-2x-4=0
，其中
滿足方程
．
，其中
．
，求代數(shù)式
的
值． 
，求
的值．
； （2）
.