先閱讀,后回答問題:x為何值時
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有意義?
解:要使
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有意義需
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≥0,
由乘法法則得:
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或
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,
解之得:x≥1 或x≤0,
即當(dāng)x≥1 或x≤0時,
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有意義。
體會解題思想后,解答,x為何值是
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有意義?
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或
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.
試題分析:根據(jù)題目信息,列出不等式組求解即可得到x的取值范圍.
試題解析:要使有意義需
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,由乘法法則得
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或
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,解之得:
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或
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,即當(dāng)
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或
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時,
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有意義.
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