slide0031.htm
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<title>第三章</title>
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<div style='mso-line-spacing:"120 5 0";position:absolute;top:6.5%;left:8.42%;
width:89.88%;height:6.0%'><span style='font-family:宋体;mso-fareast-font-family:
宋体;font-size:117%;color:#FF3300'><b>３</b></span><span lang=EN-US
style='font-size:117%;color:#FF3300;mso-fareast-language:ZH-CN'><b>. </b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:117%;color:#FF3300'><b>表达式的书写中需注意的问题</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%;display:none'><b> </b></span></div>
<div style='mso-line-spacing:"120 5 0";position:absolute;top:14.0%;left:8.42%;
width:89.88%;height:5.25%'><b><span style='mso-spacerun:yes'> </span></b><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>（</b></span><span
lang=EN-US style='mso-fareast-language:ZH-CN'><b>1</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>）运算符不能相邻。例</b></span><span
lang=EN-US style='mso-fareast-language:ZH-CN'><b>a+-b</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>是错误的。 </b></span></div>
<div style='mso-line-spacing:"120 5 0";position:absolute;top:20.75%;
left:8.42%;width:89.88%;height:5.25%'><b><span style='mso-spacerun:yes'>
</span></b><span style='font-family:宋体;mso-fareast-font-family:宋体'><b>（</b></span><span
lang=EN-US style='mso-fareast-language:ZH-CN'><b>2</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>）乘号不能省略。例</b></span><span
lang=EN-US style='mso-fareast-language:ZH-CN'><b>x </b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>乘以</b></span><span
lang=EN-US style='mso-fareast-language:ZH-CN'><b>y </b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>应写成：</b></span><span
lang=EN-US style='mso-fareast-language:ZH-CN'><b>x*y </b></span></div>
<div style='mso-line-spacing:"120 5 0";position:absolute;top:27.5%;left:8.42%;
width:89.88%;height:5.25%'><span lang=EN-US style='mso-fareast-language:ZH-CN'><b><span
style='mso-spacerun:yes'> </span></b></span><span style='font-family:
宋体;mso-fareast-font-family:宋体'><b>（</b></span><span lang=EN-US
style='mso-fareast-language:ZH-CN'><b>3</b></span><span style='font-family:
宋体;mso-fareast-font-family:宋体'><b>）括号必须成对出现，均使用圆括号。 </b></span></div>
<div style='mso-line-spacing:"120 5 0"'><span style='position:absolute;
top:34.0%;left:8.42%;width:104.68%;height:5.25%'><b><span
style='mso-spacerun:yes'> </span></b><span style='font-family:宋体;
mso-fareast-font-family:宋体'><b>（</b></span><span lang=EN-US style='mso-fareast-language:
ZH-CN'><b>4</b></span><span style='font-family:宋体;mso-fareast-font-family:
宋体'><b>）表达式从左到右在同一基准并排书写，不能出现上下</b></span></span><span style='position:absolute;
top:41.0%;left:8.42%;width:89.88%;height:4.75%'><span style='font-family:宋体;
mso-fareast-font-family:宋体'><b>标 </b></span></span></div>
<div style='mso-line-spacing:"120 5 0"'><span style='position:absolute;
top:47.0%;left:8.42%;width:104.68%;height:5.25%'><b><span
style='mso-spacerun:yes'> </span></b><span style='font-family:宋体;
mso-fareast-font-family:宋体'><b>（</b></span><span lang=EN-US style='mso-fareast-language:
ZH-CN'><b>5</b></span><span style='font-family:宋体;mso-fareast-font-family:
宋体'><b>）要注意各种运算符的优先级别，为保持运算顺序，在</b></span></span><span style='position:absolute;
top:53.5%;left:8.42%;width:105.8%;height:5.25%'><span style='font-family:宋体;
mso-fareast-font-family:宋体'><b>写ＶＢ表达式时需要适当添加括号（）</b></span><span lang=EN-US
style='mso-fareast-language:ZH-CN'><b>,</b></span><span style='font-family:
宋体;mso-fareast-font-family:宋体'><b>若用到库函数必须按</b></span></span><span
style='position:absolute;top:60.0%;left:8.42%;width:89.88%;height:6.0%'><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>库函要求书写</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%'><b>。</b></span><span
style='font-size:83%'><b><span
style='mso-spacerun:yes'>
</span></b></span><span style='font-family:宋体;mso-fareast-font-family:宋体;
font-size:83%'><b>如：</b></span><span style='font-size:117%'><b><span
style='mso-spacerun:yes'> </span> </b></span></span></div>
<div style='mso-line-spacing:"120 5 0";position:absolute;top:67.75%;
left:8.42%;width:102.62%;height:6.0%'><span style='font-size:117%'><b><span
style='mso-spacerun:yes'>
</span></b></span><span lang=EN-US style='font-size:117%;mso-ansi-language:
EN-US'><b>(</b></span><span lang=EN-US style='font-size:117%;mso-fareast-language:
ZH-CN'><b>b-sqr(b*b-4*a*c))/(2*a) </b></span></div>
<div style='mso-line-spacing:"120 5 0";position:absolute;top:76.25%;
left:8.42%;width:89.88%;height:5.5%'><span lang=EN-US style='font-family:宋体;
mso-fareast-font-family:宋体;font-size:117%;mso-fareast-language:ZH-CN;
display:none'><b> </b></span></div>
<div style='mso-line-spacing:"120 5 0";position:absolute;top:83.5%;left:8.42%;
width:89.88%;height:6.0%'><span lang=EN-US style='font-size:117%;mso-fareast-language:
ZH-CN'><b><span
style='mso-spacerun:yes'>
</span>(a+b)/(a-b)</b></span><span lang=EN-US style='font-family:宋体;
mso-fareast-font-family:宋体;font-size:83%;mso-fareast-language:ZH-CN;
display:none'><b> </b></span></div>
<div style='mso-line-spacing:"120 5 0";position:absolute;top:90.75%;
left:8.42%;width:89.88%;height:4.25%'><span lang=EN-US style='font-size:83%;
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</span></b></span></div>
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