摘要： 在解题目:“当时.求代数式的值 时.聪聪认为只要任取一个使原式有意义的值代入都有相同结果．你认为他说的有理吗?请说明理由． 解:聪聪说的有理．······································································································ 1分 ················································································ 3分 ··················································································································· 4分 ······························································································································· 5分 只要使原式有意义.无论取何值.原式的值都相同.为常数1．····························· 6分

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