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题库解析   >   其他 题型   >   OG19新题
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722 次学习
OG19新题

【OG20-P147-8题】


(12 -13 )+(13 -14 )+(14 -15 )+(15 -16 )=

    <p>A.-<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false" autocomplete="off"></textarea></span><span class="fraction non-leaf" mathquill-command-id="4"><span class="numerator" mathquill-block-id="5"><span mathquill-command-id="9">1</span></span><span class="denominator" mathquill-block-id="6"><span mathquill-command-id="8">6</span></span><span style="display:inline-block;width:0">&nbsp;</span></span></span><span>&nbsp;</span></p><p>B.0</p><p>C.<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false" autocomplete="off"></textarea></span><span class="fraction non-leaf" mathquill-command-id="4"><span class="numerator" mathquill-block-id="5"><span mathquill-command-id="9">1</span></span><span class="denominator" mathquill-block-id="6"><span mathquill-command-id="10">3</span></span><span style="display:inline-block;width:0">&nbsp;</span></span></span><span>&nbsp;</span><br>D.<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false" autocomplete="off"></textarea></span><span class="fraction non-leaf" mathquill-command-id="4"><span class="numerator" mathquill-block-id="5"><span mathquill-command-id="9">1</span></span><span class="denominator" mathquill-block-id="6"><span mathquill-command-id="11">2</span></span><span style="display:inline-block;width:0">&nbsp;</span></span></span><span>&nbsp;</span><br>E.<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"><textarea data-cke-editable="1" contenteditable="false" autocomplete="off"></textarea></span><span class="fraction non-leaf" mathquill-command-id="4"><span class="numerator" mathquill-block-id="5"><span mathquill-command-id="13">2</span></span><span class="denominator" mathquill-block-id="6"><span mathquill-command-id="12">3</span></span><span style="display:inline-block;width:0">&nbsp;</span></span></span><span>&nbsp;</span>​</p>
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答案:
C

(1/2-1/3)+(1

/3-1/4)+(1/4-1/5)+(1/5-1/6)

=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6

=1/2-1/6

=1/3


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