，其中
．
··························································································· 1分
···························································································· 3分
······························································································································· 4分時，原式=
． 6分
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的值為正整數(shù)，則整數(shù)x的值為（ ）
，其中
。 
，其中
．
，求
的值
；
；
；
．
有意義，則x應該滿足（ ）