三次根

Therefore at each time we get the roots of this cubic equation, we can decide if we keep or reject each root according to the continuity of the curved surface, the method is as follows: If , the relative cubic plane curve is just a circle, this circle can be gotten by solving .

因此在每次求得该一元三次方程的解时，我们根据曲面的连续性来判断这些根的取舍，方法如下：在处，所得的平面曲线就是圆截线，该圆截线可以由相截得到，即。

Understand 3 times, the development history.2 of formula of 4 equation extract a root.

了解三次、四次方程求根公式的发展历史。2。

In this paper, the property for the irreducible polynomial and questions of irreducibility for some special multinomial are studied, like the irreducibility question of , and the question for rational root on special integer polynomial of three, four times are studied.

本文研究了不可约多项式的性质和一些特殊多项式的不可约性问题，如的不可约性问题，同时研究了特殊的三次、四次整系数多项式的有理根问题。

The time and frequency of the polecat searching different preys and burrows were nearly the same. The polecat attacked virtually all prey offered and thus exhibited opportunistic foraging behaviour. However, it did not captured all prey with equal sequence. It first captured the zokor, then the pika and last for the root vole. In addition to using the typical musteline killing method of biting the nape of the neck, the polecat evolved a variety of killing methods suited to a range of prey types depending on the activity, size and anti-predation ability of prey. The zokor was bitten on the head, whereas the pika was killed by bites to the head or throat and the root vole was killed by bites to the head or chest. The time polecats pursued the root vole was the longest, followed by that used in pursuing the pika and the zokor.

实验结果表明：艾虎对三种猎物的搜寻时间和搜寻频次基本一致，在搜寻猎物的过程中并非已知洞道系统中所存在的食物信息，是一种机会主义的捕食者；艾虎除了具有典型鼬科动物捕杀猎物的方法外，能够根据猎物的大小、活动性和反捕食能力采用不同的捕杀方法，在捕杀猎物的过程中首先捕杀高原鼢鼠，其致死部位全部为头部，其次捕杀高原鼠兔，其致死部位除了头部外，明显增加了颈部的比例，最后捕杀根田鼠，其致死部位主要是头部和胸部；艾虎在捕杀猎物的过程中，追击根田鼠的时间最多，追击鼢鼠的时间最少，而用于捕杀根田鼠的时间最少，用于捕杀鼢鼠的时间最多，艾虎捕杀高原鼠兔后单位时间内获得的能量值最大，其次为捕杀高原鼢鼠，而捕杀根田鼠后单位时间内活动的能量值最小。

Sunday, December 2, 2007A sailor of Russia's Black Sea fleet fills out a ballot paper in a polling booth in the Ukrainian Black Sea port of Sevastopol. Russians voted on Sunday in a parliamentary election.Wednesday, December 5, 2007Would-be immigrants arrive at Las Vistas beach on Tenerife in the Canary Islands. Ninety-two Africans were intercepted aboard two fishing boats.Monday, December 3, 2007

不久前在丹寨县召开的贵州省水家学会第八次学术研讨交流会上，潘朝霖大胆地提出了他自费悬赏5万至10万元寻找破译释读水书高手的惊人举动，即凡是能够译读镌刻在三都水族自治县三洞乡水根村"天下第一水族古文字碑林"上的1500余水族古文字者，可予以5万元奖励；凡是能够破译三都县的《九星诵读卷》、《九星卷》、《井巨》、丹寨县的《九星》和独山县的《井巨卷》5部水书典籍者，可予以10万元奖励。

Results: The optimum extracting process for Pueraria lobata is adding 70% alcohol into meterials and refluxing for 3 times, 1.5 hours every time.

结果：葛根最佳提取工艺为70％乙醇回流提取三次，每次加醇7倍量、提取时间为1.5小时。

He was very angry.He told his father that the new coach's stupid son,Ranny,kricked him three times that with the stick.

非常生气。他告诉他爸爸，那个新来的教练的傻儿子，用一根棍子在一天内把他绊倒过三次。

Zeiss began to make improvements in microscopes, offering simple microscopes and in 1857 introducing the first compound (which employ an objective and an eyepiece) microscope "Stand I". In 1861 Zeiss compound microscopes are declared to be "among the most excellent instruments made in Germany" and he is awarded a Gold medal at the Thuringian Industrial Exhibition. By 1864 the need to house some 200 employees results in another move of the workshop to a third larger site at Johannisplatz 10. In 1866 the 1000th microscope is delivered; the Carl Zeiss shop is recognized throughout European scientific circles for the quality of its microscopes.

蔡司开始对显微镜进行改进，生产简便显微镜，并在1857年推出了第一种复合显微镜&Stand I&型。1861年蔡司复合显微镜被认为是&德国制造的最出色的仪器&，并被授予图林根工业博览会金奖。1864年由于已经拥有200名雇员了，工厂不得不第三次搬迁到Johannisplatz 街10号的更大的地点。1866年生产了第1000台显微镜；欧洲科学界通过高质量的显微镜而认识了卡尔蔡司工厂。

Escaping once from spear-throwing Turkana in northern Kenya, he felt the chain come off, but managed to coast downhill to safety. He crossed China from north to south—in 2006, at 72—with just three brake-block changes, one jammed rear-brake cable and a change of tape on the handlebars.

在肯尼亚北路受到Turkana 人投矛袭击时，他感觉车链子掉了，但却成功地滑行下山到了安全地带。2006年，72岁时他在中国从北部骑到南部，其间只换了三次刹车皮，一根失灵的后刹车线和把手上的皮带。

He strutted around the court with his now customary swagger, torpedoing balls with complete disregard to the score and occasion that underlined his high expectations.97年,safin的第一次kremlin杯比赛中,在输了第三个抢七之后败给了老手 Kenneth Carlsen.

他是速度与天然的power的结合体，这种power那样的浑然天成，而不是粗暴的蛮力。safin那把红色的Head网球拍在他手上显得那么渺小，就如同摆动一根树枝。他在球场上用他那特有的傲慢展示着自我，无视分数与场合毁坏着球，这也是对于他高期待的不屑。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。