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本题由chris提供
409 次学习

Which of the following describes all values of x for which 1x20 ​?


    <p>(A)&nbsp;<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><var mathquill-command-id="5">x</var><span class="binary-operator" mathquill-command-id="6">≥</span><span mathquill-command-id="8">1</span></span><span>&nbsp;</span></p><p>(B)&nbsp;<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><var mathquill-command-id="5">x</var><span class="binary-operator" mathquill-command-id="9">≤</span><span mathquill-command-id="11" class="unary-operator">−</span><span mathquill-command-id="8">1</span></span><span>&nbsp;</span></p><p>(C)&nbsp;<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span mathquill-command-id="12">0</span><span class="binary-operator" mathquill-command-id="13">≤</span><var mathquill-command-id="5">x</var><span class="binary-operator" mathquill-command-id="9">≤</span><span mathquill-command-id="8">1</span></span><span>&nbsp;</span></p><p>(D)&nbsp;<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><var mathquill-command-id="18">x</var><span class="binary-operator" mathquill-command-id="16">≤</span><span mathquill-command-id="19" class="unary-operator">−</span><span mathquill-command-id="20">1</span></span><span>&nbsp;</span>or&nbsp;<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><var mathquill-command-id="18">x</var><span class="binary-operator" mathquill-command-id="24">≥</span><span mathquill-command-id="20">1</span></span><span>&nbsp;</span></p><p>(E)&nbsp;<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false"></textarea></span><span mathquill-command-id="27" class="">−</span><span mathquill-command-id="20">1</span><span class="binary-operator" mathquill-command-id="28">≤</span><var mathquill-command-id="30">x</var><span class="binary-operator" mathquill-command-id="31">≤</span><span mathquill-command-id="33">1</span></span><span>&nbsp;</span>​</p><p><br></p>
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答案:
E

1-="kfformula" src="data:image/png;base64,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" data-latex="{X}^{2}"/>0

=>1

    1

=>    -1<=x<=1

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