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标题: 几道不明白的机经 [打印本页]

作者: tongxun    时间: 2002-8-28 19:02     标题: 几道不明白的机经

1、75 .  Q:    问Y=MX+H 是不是与X 轴有交点。
(1) M< 0
(2) H > 0

A:  a 【确定】 注意:与65题区别!!·!!
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单纯知道M,能确定X有没有解吗?
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2、89.  Q:  如果一个定单的书价低于$15,则运费为$3,如果一个定单的书价高于$15,则运费为书价的20%,问两个定单X和Y的运费总共为多少?
1)X的书价加Y的书价=$18.75
2)X的书价和Y的书价都高于$4

A:   A【确定】
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为什么不是C?因为不管书价如何,运费总是要的。16+2.75试试?
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3、96。Q:有图,sth(考试时不认识,理解下来是半个圆柱体) is been cut half of a cylinda, the diameter of it 5, the volum of it is 35, ask you what is its high

70/(p*2.5^2) 【确定】
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这题还不知道怎样切的,如何能确定???[em27]
作者: yulei69    时间: 2002-8-29 06:02

No. 1: As long as M is not 0, there must be a intersection. Therefore, a) sufficient, b) not sufficient cause no info about M No.2 I believe it is C. Because $18.75=$9 +$9.75 or $18.75=$2+$16.75. fee is different. If b) is added, because if both > 4 then both must <15. No.3 Need to assum it is cut vertically




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