1。 是圆桌么？ 2。灯光题应该是10根2，天花板中心点到四个角落任意一个，这是灯光点到屋子的最大距离。 3。12. in a survey of the number of goose, scientists harvest A （数字忘记了)个 eggs and select 2 eggs out of 90% nests have more than 5 eggs, and there are B nests that have 4 eggs. There are no other nests. So what is the total number of nests surveyed ?那位解释一下意思？~ 4。13. X is a positive integer and the sum of all the units digit is 170 , Y is a integer, and X=10^20-Y, then what might be the value of Y? 我的理解其他和之前的同学一样，但是题目没有给出选项，而且题目应该不全吧，因为Y的位数不知道，eg:Y是两位数，则X为18*9+8=170 末两位和为8。（17 26 35 44 53 62 71）则Y 应满足 83 74依次类推 5。 第四题题目应该是不完整的，大家不要太在意了。 最后，狗狗帮大家理解一下题目，本身由于不大准确，看不懂也不要深究啦，熟悉一下题上战场~ 大家加油~
9.to make a food, one may use chocolate and peanut, the cost of 2 pounds chocolate and 3 pounds peanut to make such a food is 3.8 per pound, if the cost of chocolate is 2 more than (or less than) that of peanut, how much does peanut cost? 不大好说啊，之前那位同学3.8*5 的5是怎么来的 应该是NEW的COST吧 但是是5吗？（2+3？）求教~
9.to make a food, one may use chocolate and peanut, the cost of 2 pounds chocolate and 3 pounds peanut to make such a food is 3.8 per pound, if the cost of chocolate is 2 more than (or less than) that of peanut, how much does peanut cost? 不大好说啊，之前那位同学3.8*5 的5是怎么来的 应该是NEW的COST吧 但是是5吗？（2+3？）求教~
5. In a room, the source of light is in the central of ceiling, the room has a width of 16, length of 12, a height of 10, and then what is the greatest distance that a light beam could reach within the house? cube ,calculate the diagonal distance。 应该是求。从天花板中央到地下一个顶点的距离..画图求出底面对角线。。一般刚好是10。。高又是10。。求出来是10倍根号2。
7. X is a positive integer and the sum of all the units digit is 170, Y is a integer, and X=10^20-Y, then what might be the value of Y? 18X9=162 10的20次方等于1后面20个零。。减一个数后。。20位的一个数。。可能前面全是9，再看选项
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发表于 2010-5-25 22:37:19
