调递增．
∴G（t）＞G（1）＝0，即ln﹣2＞0，
又因为x2﹣x1＞0，∴
＞f′（）．
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本文部分内容来自网络，本人不为其真实性负责，如有异议请及时联系，本人将予以删除BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiu BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiu BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiu BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiu BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiu BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiu 第21页（共22页）
BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiu BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiu BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiu BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiu BaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiuBaidubaidubaidubaidubadiubadiu
第22页（共22页）
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