[原创]2月12号 济南一战 一点鸡精

vivienzhou

刚想起一道数学题

说一个数N，它的质数分别表示为p1,p2,p3....有这么一个公式表示为：N(1-p1)(1-p2)...这个公式表示N的一个....忘了，然后求 60... 题目有点长，不过意思就是把60因式分解，然后带入上面式子的出的结果。

还有几道题考了7的N次方的一些特性：个位数以7，9，3，1循环这样的。

那篇夏威夷的RC:

Proto-historic Hawaiian temples on the island of Maui may have mushroomed up within just 30 years, not 250 as previously supposed, scientists say. The findings could significantly alter researchers' understanding of the pace of precontact sociopolitical change in the Pacific.

Hawaiian genealogies and oral histories hold that sometime around 1600 A.D. a ruler named Pi'ilani united two opposing chiefdoms on Maui into a peaceful kingdom, marking the emergence of a religious state on the island. Archaeologists had been unable to confirm that sequence of events, however, in part because of the limitations of carbon dating.

In the new work, Patrick V. Kirch and Warren D. Sharp of the University of California and Berkeley used another kind of radiometric technique involving thorium-230, rather than carbon-14, to date bits of branch coral that were collected from living reefs and left as divine offerings at seven different temples during construction. Dates for these corals, which had been incorporated into walls and platform fill, all fell in a narrow range of 1565 to 1638 A.D., give or take a few years on either end. Moreover, dates on the samples that best reflect the time they were harvested from the sea--those from the coral branch tips--ranged from 1608 to 1638 A.D., an interval of just 30 years. These findings thus point to intensive temple-building during that time. Because temples served as centers for control of production and the collection of surplus goods, the team contends, it seems likely that the construction boom accompanied a profound shift in sociopolitical structure.

Kirch and Sharp observe that the conquests described by local oral traditions coincide with these new dates, and would have more than doubled the size of the Maui polity to upwards of 2,360 square kilometers--the magnitude of expansion expected with the formation of an archaic state. "The temples provide tangible archaeological evidence of the speed with which a fundamental sociopolitical transition occurred in proto-historic Hawaii," the authors conclude. Indeed, they note, it may have happened in the span of a single generation of Hawaiians.

这是我前几天从CD上找的.这篇阅读理解是在30-35题中出现的。

抱歉语法和逻辑现在脑子里一片空白，想不起来。

jsrdszl

再次感谢LZ。。

开心一辈子

谢啦，真好~~~23号一战，希望也如此顺利！！！

wentaow2008

 楼主MM好厉害..恭喜