成绩很糟,数学这道题确实是没有答案,看了2篇jj发现都有这个问题!我也没做出来,瞎蒙一个了事,大家小心!
1】125. A circle surrounded by a metal ring. The radius of circle is r and the width of metal ring is s. Find the area of the ring. (However, I couldn’t find this answer from the choice, I can only find (a) pai*s(2r-s), (b) pai*r(2s-r),
[确定]Ans.: pai*s(2r+s)。
2】还有圆环那道题,因为考前对题目本身有争议,所以记得比较清。 附上周JJ:
a circle xxx with the radius r, is made of a xx glass ball surrounded by a circle metal. The width of the metal circle is s. Find the area of the metal circle.
因为考试是有图的,所以不用太紧张,列出式子化简以后就可以找出答案了。
then it will be
pai*s(2r+s)
but ...
firstly , how come 'The radius of circle' is that of the circle plus the surrounded ring ?
secondly , there is no answer with '+' available...
^^作者: 回家过年 时间: 2002-12-26 12:03
xiaoyaya说得对吧,我太粗心了
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