摘要： 化简.并选择你最喜欢的数代入求值． 解:原式······················································································ 2分 ·········································································································· 4分 ···························································································································· 5分 选取除0与1以外的任何值.求代数式的值 6分
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，并选择你最喜欢的数代入求值．
，并选择你最喜欢的数代入求值．
，并选择你最喜欢的数代入求值．
，并选择你最喜欢的数代入求值．
，并选择你最喜欢的数代入求值．