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作者: zjf    时间: 2002-12-12 22:33     标题: 帮忙

[fly]HELP:
R 方法和 S 方法不同在R方法下的6,24分别对应S方法下的30,60,R和S成LINEAR关系。问要得到S方法下的100,应在R方法下是多少?

答案是48,可我没思路。
谢谢
作者: wuzi    时间: 2002-12-12 23:20

[em06][em06]
r方法对应坐标系x轴,s方法对应y轴,该题已知条件两点坐标(6,30)(24,60),求y=100时,x=多少?
解:根据两点式直线方程(y-y1)/(x-x1)=(y1-y2)/(x1-x2)
    (y-30)/(x-6)=(60-30)/(24-6)
     得3y=5x+60,代入y=100,
     得x=48.
作者: iamf    时间: 2002-12-13 00:43

u can also solve this problem as following:
'cause R and S are linear.. then we can suppose R=aS+b
we know (6,30) (24,60).
then we have a=0.6 b=-12

if S=100, R=48
作者: zjf    时间: 2002-12-13 08:09

Thank you very much for helping me,i will take the test next week, but still think there are too much to be review, i can not even know which part should i pay more attention to in only the limit days. some opinions?
作者: maryland    时间: 2002-12-13 13:21

复习的方向应该是针对自己的弱点做最后的强化训练。最后几天则可以看看最近1个月的JJ。




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