【自我挑战12】
求a b c x y 值 <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><FONT face="Times New Roman"><SPAN style="mso-list: Ignore">1、<SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></SPAN>pol</FONT>：九边形，边长<FONT face="Times New Roman">20</FONT>；</P><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><SPAN style="mso-list: Ignore"><FONT face="Times New Roman">2、<SPAN style="FONT: 7pt 'Times New Roman'"> </FONT></SPAN></SPAN>画垂线：点<FONT face="Times New Roman">ab</FONT>中点和九边形下顶点；</P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><FONT face="Times New Roman"><SPAN style="mso-list: Ignore">3、<SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></SPAN>x</FONT>：点选九边形；</P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><SPAN style="mso-list: Ignore"><FONT face="Times New Roman">4、<SPAN style="FONT: 7pt 'Times New Roman'"> </FONT></SPAN></SPAN>删除垂线一边图形，保留一半图形；</P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><FONT face="Times New Roman"><SPAN style="mso-list: Ignore">5、<SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></SPAN>o</FONT>：距离<FONT face="Times New Roman">20</FONT>，点直线，方向有图形的一边；</P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><FONT face="Times New Roman"><SPAN style="mso-list: Ignore">6、<SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></SPAN>c</FONT>：圆心点<FONT face="Times New Roman">b,</FONT>半径点<FONT face="Times New Roman">be;</FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><FONT face="Times New Roman"><SPAN style="mso-list: Ignore">7、<SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></SPAN>ro</FONT>：点选九边形任意左右三条相连的直线，基点<FONT face="Times New Roman">b,</FONT>参照点<FONT face="Times New Roman">e,</FONT>旋转至垂线与圆相交处；</P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><FONT face="Times New Roman"><SPAN style="mso-list: Ignore">8、<SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></SPAN>c</FONT>：圆心选上一步旋转的三直线的端点，画四圆；</P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><FONT face="Times New Roman"><SPAN style="mso-list: Ignore">9、<SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></SPAN>mi</FONT>：三直线和四圆；</P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><SPAN style="mso-list: Ignore"><FONT face="Times New Roman">10、<SPAN style="FONT: 7pt 'Times New Roman'"> </FONT></SPAN></SPAN>画第九个圆：相切、相切、半径<FONT face="Times New Roman">10</FONT>；</P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><SPAN style="mso-list: Ignore"><FONT face="Times New Roman">11、<SPAN style="FONT: 7pt 'Times New Roman'"> </FONT></SPAN></SPAN>画直线连接三圆圆心；</P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><FONT face="Times New Roman"><SPAN style="mso-list: Ignore">12、<SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></SPAN>O</FONT>：距离<FONT face="Times New Roman">10</FONT>，点选上一步所画直线和<FONT face="Times New Roman">ab</FONT>、<FONT face="Times New Roman">cd</FONT>；</P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><FONT face="Times New Roman"><SPAN style="mso-list: Ignore">13、<SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></SPAN>Fillet</FONT>：半径＝<FONT face="Times New Roman">0</FONT>，点选上一步偏移直线。</P> <P>荤！这么上传图片没有？</P>
<P>再试一次！</P> <P>为什么？看不见上传的图片！</P>
<P>a:29.8549；b:41.7976；c:296446；x:101；y:79。</P>
<P> </P> 这题的结果不确定。 请问tqr兄：此题是不是有无限个解？如果只是几个解而已，我可加设限制条件使题目更完美。 初步设想：限定等腰梯形的底角。 原先我也是想如此，后来才想变换口味吧。谢谢兄台的建议。
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