📄 例6-12.mht
字号:
lang=3DEN-US>6-12</span><span style=3D'font-family:SimSun;mso-ascii-font-fa=
mily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>】马=
克思曾经做过这样一=
6947;趣味数学题:有</span><span
lang=3DEN-US>30</span><span style=3D'font-family:SimSun;mso-ascii-font-fami=
ly:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>个人在一&#=
23478;小饭馆里用餐,其È=
13;有男士、女士和儿童=
。每位男士花</span><span
lang=3DEN-US>3</span><span style=3D'font-family:SimSun;mso-ascii-font-famil=
y:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>先令,每&#=
20301;女士花</span><span
lang=3DEN-US>2</span><span style=3D'font-family:SimSun;mso-ascii-font-famil=
y:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>先令,每&#=
20301;儿童花</span><span
lang=3DEN-US>1</span><span style=3D'font-family:SimSun;mso-ascii-font-famil=
y:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>先令,一&#=
20849;花去</span><span
lang=3DEN-US>50</span><span style=3D'font-family:SimSun;mso-ascii-font-fami=
ly:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>先令。问&#=
30007;士、女士和儿童各ć=
77;几人?</span></p>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>分析:设有</span><i
style=3D'mso-bidi-font-style:normal'><span lang=3DEN-US>x</span></i><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>位男士,</span><i style=3D'mso-b=
idi-font-style:
normal'><span lang=3DEN-US>y</span></i><span style=3D'font-family:SimSun;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Ro=
man"'>位女士,</span><i
style=3D'mso-bidi-font-style:normal'><span lang=3DEN-US>z</span></i><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>位儿童。依题意=
,列出以下方程组:</s=
pan></p>
<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><span lang=
=3DEN-US><sub><!--[if gte vml 1]><v:shapetype
id=3D"_x0000_t75" coordsize=3D"21600,21600" o:spt=3D"75" o:preferrelative=
=3D"t"
path=3D"m@4@5l@4@11@9@11@9@5xe" filled=3D"f" stroked=3D"f">
<v:stroke joinstyle=3D"miter"/>
<v:formulas>
<v:f eqn=3D"if lineDrawn pixelLineWidth 0"/>
<v:f eqn=3D"sum @0 1 0"/>
<v:f eqn=3D"sum 0 0 @1"/>
<v:f eqn=3D"prod @2 1 2"/>
<v:f eqn=3D"prod @3 21600 pixelWidth"/>
<v:f eqn=3D"prod @3 21600 pixelHeight"/>
<v:f eqn=3D"sum @0 0 1"/>
<v:f eqn=3D"prod @6 1 2"/>
<v:f eqn=3D"prod @7 21600 pixelWidth"/>
<v:f eqn=3D"sum @8 21600 0"/>
<v:f eqn=3D"prod @7 21600 pixelHeight"/>
<v:f eqn=3D"sum @10 21600 0"/>
</v:formulas>
<v:path o:extrusionok=3D"f" gradientshapeok=3D"t" o:connecttype=3D"rect"/>
<o:lock v:ext=3D"edit" aspectratio=3D"t"/>
</v:shapetype><v:shape id=3D"_x0000_i1025" type=3D"#_x0000_t75" style=3D'wi=
dth:78.6pt;
height:32.4pt' o:ole=3D"" fillcolor=3D"window">
<v:imagedata src=3D"file1410.files/image001.wmz" o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D105 height=3D43
src=3D"file1410.files/image002.gif" v:shapes=3D"_x0000_i1025"><![endif]></s=
ub><!--[if gte mso 9]><xml>
<o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1025"
DrawAspect=3D"Content" ObjectID=3D"_1127381372">
</o:OLEObject>
</xml><![endif]--></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>由于</span><span lang=3DEN-US>2</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>个方程式中有</span><=
span
lang=3DEN-US>3</span><span style=3D'font-family:SimSun;mso-ascii-font-famil=
y:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>个未知数&#=
65292;属于不定方程,无Ė=
61;直接求解。可以用“&=
#31351;举法”来进行“试੬=
1;”,即将各种可能的</=
span><i
style=3D'mso-bidi-font-style:normal'><span lang=3DEN-US>x</span></i><i
style=3D'mso-bidi-font-style:normal'><span style=3D'font-family:SimSun;mso-=
ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>、</span><=
span
lang=3DEN-US>y</span></i><i style=3D'mso-bidi-font-style:normal'><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>、</span><span lang=3DEN-US>z</span></i><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>组合一一进行测=
试,将符合条件者输=
0986;即可。</span></p>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>根据题意,可推=
算出最多只能有</span><span
lang=3DEN-US>16</span><span style=3D'font-family:SimSun;mso-ascii-font-fami=
ly:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>位男士,&#=
26368;多只能有</span><span
lang=3DEN-US>24</span><span style=3D'font-family:SimSun;mso-ascii-font-fami=
ly:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>位女士。</=
span></p>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>设计步骤如下:=
</span></p>
<p class=3DMsoNormal style=3D'mso-line-height-alt:0pt'><span lang=3DEN-US><=
span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>①</span> <span style=3D'font-family:SimSun;mso-asc=
ii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>建立=
用户界面和设置对象=
3646;性,如图</span><span
lang=3DEN-US>6-17</span><span style=3D'font-family:SimSun;mso-ascii-font-fa=
mily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>(左=
)所示。</span></p>
<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><span lang=
=3DEN-US
style=3D'mso-font-kerning:0pt;mso-no-proof:yes'><!--[if gte vml 1]><v:shape=
id=3D"_x0000_i1026"
type=3D"#_x0000_t75" style=3D'width:136.8pt;height:100.8pt'>
<v:imagedata src=3D"file1410.files/image003.png" o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D182 height=3D134
src=3D"file1410.files/image004.gif" v:shapes=3D"_x0000_i1026"><![endif]><sp=
an
style=3D'mso-spacerun:yes'> </span><!--[if gte vml 1]><v:shape id=3D"=
_x0000_i1027"
type=3D"#_x0000_t75" style=3D'width:136.8pt;height:100.8pt'>
<v:imagedata src=3D"file1410.files/image005.png" o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D182 height=3D134
src=3D"file1410.files/image006.jpg" v:shapes=3D"_x0000_i1027"><![endif]></s=
pan><span
lang=3DEN-US style=3D'mso-no-proof:yes'><o:p></o:p></span></p>
<h6><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roma=
n";
mso-hansi-font-family:Roman'>图</span><span lang=3DEN-US>6-17<span
style=3D'mso-spacerun:yes'> </span></span><span style=3D'font-family:=
SimSun;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:Roman'>ษ=
9;味数学题</span></h6>
<p class=3DMsoNormal style=3D'mso-line-height-alt:0pt'><span lang=3DEN-US><=
span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>②</span> <span style=3D'font-family:SimSun;mso-asc=
ii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>编写=
事件代码。</span></p>
<p class=3DMsoNormal style=3D'mso-line-height-alt:0pt'><span lang=3DEN-US><=
span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>编写“计算”命&#=
20196;按钮</span><span
lang=3DEN-US style=3D'mso-bidi-font-weight:bold'>Command</span><span lang=
=3DEN-US>1</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>的</span><span lang=3DEN-US>Click</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>(单击)事件代=
码:</span></p>
<p class=3Da><b style=3D'mso-bidi-font-weight:normal'><span lang=3DEN-US>Pr=
ivate Sub
Command1_<span class=3DGramE>Click()</span><o:p></o:p></span></b></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'>
</span>List1.Clear</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>For x
=3D 1 To 16<span style=3D'mso-spacerun:yes'> </span><span
style=3D'mso-tab-count:7'> &=
nbsp; &nbs=
p; &=
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