< ><FONT face="Times New Roman"> <p></p></FONT></P>
< ><B >B:降落伞选购<p></p></B></P>
< >需要选购一些规格固定的降落伞向灾区空投救灾物质,空投高度<FONT face="Times New Roman">500m</FONT>,救灾物质落地的速度不能超过<FONT face="Times New Roman">20m/s</FONT>。知道降落伞面是半径为<FONT face="Times New Roman">r</FONT>的半球面,每个降落伞都有<FONT face="Times New Roman">16</FONT>根相同长度<FONT face="Times New Roman">L</FONT>的绳索。每个降落伞的制造费用固定为<FONT face="Times New Roman">200</FONT>元,绳索价格<FONT face="Times New Roman">4</FONT>元<FONT face="Times New Roman">/m</FONT>,降落伞面费用见表<FONT face="Times New Roman">1</FONT>。<p></p></P>
<P >降落伞在降落过程中受到的空气阻力与降落速度以及伞面积成正比。用半径<FONT face="Times New Roman">r=3m</FONT>、载重<FONT face="Times New Roman">300kg</FONT>的降落伞从<FONT face="Times New Roman">500m</FONT>高度降落,得到一些数据如表<FONT face="Times New Roman">2</FONT>。<p></p></P>
<P >要求:<p></p></P>
<P ><FONT face="Times New Roman">1</FONT>、当救灾物质共<FONT face="Times New Roman">2000kg</FONT>时,确定降落伞的选购方案,使购买费用尽可能少?<p></p></P>
<P ><FONT face="Times New Roman">2</FONT>、当救灾物质不能被随意连续分割时,为使购买费用尽可能少建立数学模型,并对表<FONT face="Times New Roman">3</FONT>数据给出结果。<p></p></P>
<P >表<FONT face="Times New Roman">1<p></p></FONT></P>
<TABLE cellSpacing=0 cellPadding=0 border=1>
<TR>
<TD vAlign=top width=89>
<P ><FONT face="Times New Roman">r</FONT>(<FONT face="Times New Roman">m</FONT>)<p></p></P></TD>
<TD vAlign=top width=89>
<P ><FONT face="Times New Roman">2<p></p></FONT></P></TD>
<TD vAlign=top width=89>
<P ><FONT face="Times New Roman">2.5<p></p></FONT></P></TD>
<TD vAlign=top width=89>
<P ><FONT face="Times New Roman">3<p></p></FONT></P></TD>
<TD vAlign=top width=89>
<P ><FONT face="Times New Roman">3.5<p></p></FONT></P></TD>
<TD vAlign=top width=89>
<P ><FONT face="Times New Roman">4<p></p></FONT></P></TD></TR>
<TR>
<TD vAlign=top width=89>
<P >费用(元)<p></p></P></TD>
<TD vAlign=top width=89>
<P ><FONT face="Times New Roman">65<p></p></FONT></P></TD>
<TD vAlign=top width=89>
<P ><FONT face="Times New Roman">170<p></p></FONT></P></TD>
<TD vAlign=top width=89>
<P ><FONT face="Times New Roman">350<p></p></FONT></P></TD>
<TD vAlign=top width=89>
<P ><FONT face="Times New Roman">660<p></p></FONT></P></TD>
<TD vAlign=top width=89>
<P ><FONT face="Times New Roman">1000<p></p></FONT></P></TD></TR></TABLE>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P >表<FONT face="Times New Roman">2<p></p></FONT></P>
<TABLE cellSpacing=0 cellPadding=0 border=1>
<TR>
<TD vAlign=top width=114>
<P >时刻<FONT face="Times New Roman">t</FONT>(<FONT face="Times New Roman">s</FONT>)<p></p></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">0<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">3<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">6<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">9<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">12<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">15<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">18<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">21<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">24<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">27<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">30<p></p></FONT></P></TD></TR>
<TR>
<TD vAlign=top width=114>
<P >高度<FONT face="Times New Roman">h</FONT>(<FONT face="Times New Roman">m</FONT>)<p></p></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">500<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">470<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">425<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">372<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">317<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">264<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">215<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">160<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">108<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">55<p></p></FONT></P></TD>
<TD vAlign=top width=38>
<P ><FONT face="Times New Roman">1<p></p></FONT></P></TD></TR></TABLE>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P >表<FONT face="Times New Roman">3<p></p></FONT></P>
<TABLE cellSpacing=0 cellPadding=0 border=1>
<TR>
<TD vAlign=top width=115>
<P >物质规格(<FONT face="Times New Roman">kg</FONT>)<p></p></P></TD>
<TD vAlign=top width=82>
<P ><FONT face="Times New Roman">2<p></p></FONT></P></TD>
<TD vAlign=top width=82>
<P ><FONT face="Times New Roman">3<p></p></FONT></P></TD>
<TD vAlign=top width=82>
<P ><FONT face="Times New Roman">5<p></p></FONT></P></TD>
<TD vAlign=top width=82>
<P ><FONT face="Times New Roman">18<p></p></FONT></P></TD>
<TD vAlign=top width=82>
<P ><FONT face="Times New Roman">24<p></p></FONT></P></TD></TR>
<TR>
<TD vAlign=top width=115>
<P >数量(个)<p></p></P></TD>
<TD vAlign=top width=82>
<P ><FONT face="Times New Roman">40<p></p></FONT></P></TD>
<TD vAlign=top width=82>
<P ><FONT face="Times New Roman">30<p></p></FONT></P></TD>
<TD vAlign=top width=82>
<P ><FONT face="Times New Roman">30<p></p></FONT></P></TD>
<TD vAlign=top width=82>
<P ><FONT face="Times New Roman">25<p></p></FONT></P></TD>
<TD vAlign=top width=82>
<P ><FONT face="Times New Roman">12<p></p></FONT></P></TD></TR></TABLE>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P >[em06] <FONT face=幼圆 color=#b822dd size=3>请高手解答!如果完成就发贴子,或者发EMAIL给我!</FONT><a href="mailtjerik@avl.com.cn" target="_blank" ><FONT face=幼圆 color=#b822dd size=3>jerik@avl.com.cn</FONT></A></P>