帮帮忙,解一下题
<img src="http://xuedu.com.cn/xdbbs/file/imgup/15/36/20060919/file_3004_1158639322159.jpg" border="0" alt=""/> <p>试着做一下，虽然没学分了。</p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span lang="EN-US" style="FONT-SIZE: 15pt;">F<sup>1</sup> (0)=f(0)=a<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span lang="EN-US" style="FONT-SIZE: 15pt;">F<sup>2</sup>(0)=f(a)<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">当</span><span lang="EN-US" style="FONT-SIZE: 15pt;">a=b</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">时</span><span lang="EN-US" style="FONT-SIZE: 15pt;">f<sup>2</sup></span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">（</span><span lang="EN-US" style="FONT-SIZE: 15pt;">0</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">）</span><span lang="EN-US" style="FONT-SIZE: 15pt;">=f(a)=0</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">所以</span><span lang="EN-US" style="FONT-SIZE: 15pt;">k=2</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">；</span><span lang="EN-US" style="FONT-SIZE: 15pt;"><p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">当</span><span lang="EN-US" style="FONT-SIZE: 15pt;">a+1=b</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">时</span><span lang="EN-US" style="FONT-SIZE: 15pt;">f<sup>2</sup></span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">（</span><span lang="EN-US" style="FONT-SIZE: 15pt;">0</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">）</span><span lang="EN-US" style="FONT-SIZE: 15pt;">=a-b=-1</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">，超出定义域</span><span lang="EN-US" style="FONT-SIZE: 15pt;"><p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">当</span><span lang="EN-US" style="FONT-SIZE: 15pt;">a+1<b</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">时</span><span lang="EN-US" style="FONT-SIZE: 15pt;">,f<sup>2</sup>(0)=f(a)=2a<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">一下再分析</span><span lang="EN-US" style="FONT-SIZE: 15pt;">2a</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">与</span><span lang="EN-US" style="FONT-SIZE: 15pt;">b</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">的关系</span><span lang="EN-US" style="FONT-SIZE: 15pt;">,</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">以确定</span><span lang="EN-US" style="FONT-SIZE: 15pt;">k</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">的值</span><span lang="EN-US" style="FONT-SIZE: 15pt;">.<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">由此可见</span><span lang="EN-US" style="FONT-SIZE: 15pt;">k</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">的最小值为</span><span lang="EN-US" style="FONT-SIZE: 15pt;">2<p></p></span></p><p></p> <p>试着做一下，虽然没学分了。</p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span lang="EN-US" style="FONT-SIZE: 15pt;">F<sup>1</sup> (0)=f(0)=a<p></p></span></p><p></p><p></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span lang="EN-US" style="FONT-SIZE: 15pt;">F<sup>2</sup>(0)=f(a)<p></p></span></p><p></p><p></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">当</span><span lang="EN-US" style="FONT-SIZE: 15pt;">a=b</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">时</span><span lang="EN-US" style="FONT-SIZE: 15pt;">f<sup>2</sup></span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">（</span><span lang="EN-US" style="FONT-SIZE: 15pt;">0</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">）</span><span lang="EN-US" style="FONT-SIZE: 15pt;">=f(a)=0</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">所以</span><span lang="EN-US" style="FONT-SIZE: 15pt;">k=2</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">；</span><span lang="EN-US" style="FONT-SIZE: 15pt;"><p></p></span></p><p></p><p></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">当</span><span lang="EN-US" style="FONT-SIZE: 15pt;">a+1=b</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">时</span><span lang="EN-US" style="FONT-SIZE: 15pt;">f<sup>2</sup></span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">（</span><span lang="EN-US" style="FONT-SIZE: 15pt;">0</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">）</span><span lang="EN-US" style="FONT-SIZE: 15pt;">=a-b=-1</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">，超出定义域</span><span lang="EN-US" style="FONT-SIZE: 15pt;"><p></p></span></p><p></p><p></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">当</span><span lang="EN-US" style="FONT-SIZE: 15pt;">a+1<b</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">时</span><span lang="EN-US" style="FONT-SIZE: 15pt;">,f<sup>2</sup>(0)=f(a)=2a<p></p></span></p><p></p><p></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">一下再分析</span><span lang="EN-US" style="FONT-SIZE: 15pt;">2a</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">与</span><span lang="EN-US" style="FONT-SIZE: 15pt;">b</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">的关系</span><span lang="EN-US" style="FONT-SIZE: 15pt;">,</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">以确定</span><span lang="EN-US" style="FONT-SIZE: 15pt;">k</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">的值</span><span lang="EN-US" style="FONT-SIZE: 15pt;">.<p></p></span></p><p></p><p></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">由此可见</span><span lang="EN-US" style="FONT-SIZE: 15pt;">k</span><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">的最小值为</span><span lang="EN-US" style="FONT-SIZE: 15pt;">2<p></p></span></p><p></p><p></p><p></p>我不是故意发两次的，可别扣我分啊[此贴子已经被作者于2006-12-11 19:44:10编辑过]
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