三次方程

A cubic expression, curve, or equation .

三次表达式，三次曲线，三次方程

I must work out the cubic equation.

我必须解出这道三次方程。

Test results showed that the decayof X2ray in some kind of explosive was obvious and its law conformed with cubic equation.

研究结果表明，X 射线在某炸药中的衰减是比较明显的，其衰减规律符合三次方程形式。

The nonlinear equation of β obtained is subsequently approximated by a cubic equation from which β is solved directly.

利用这一极值原理，得到一个关于β的非线性方程，近似简化后成三次方程，直接求解。

The equation of van der Waals is a cubic equation about volume.

范德瓦尔斯方程是体积V的三次方程。

How to resolve a cubic equation?

如何解三次方程？

This paper takes Daqing City of Northeastern China s Heilongjiang Province as an example,and introduces the way of gaining land cover information based on the TM image.Then the cubic equation is established to describe the dynamic situation of account of land use.

该文以大庆市为实例，介绍了以TM卫星影像数据为数据源，提取土地覆盖信息的方法，并以此为基础建立以时间为自变量的三次方程，来描述土地利用类型的数量的动态情况。

The method that simple cubic equation was changed from general to standard was introduced and the distribution of standardized real root was illustrated, which solved the problem of the distribution of any real root for simple cubic equation.

摘要介绍了一元三次方程一般式化为标准式的方法，结合图形给出了标准式的实数根的分布情况，从而解决了任意一元三次方程的实数根的分布的问题。

With the help of the chart of "Unit Cubic Parabola"presented in this paper, clvil engineers may findit more convenient to acquire the routs uf the cubic-equation.

借助本文建立的"单位三次抛物线"图线，工程设计人员可以快速图解出三次方程的根，从而进行相关的应力计算或其它分析。

About the calculation of casting weight and module,in this paper,the castings are divided three styles:standard castings used usually castings and complex castings. Different methods have been adopted according to different castings.

在冒口优化设计中，采用了两种计算方法：（1）理论性较强的Ruddle三次方程法，并将 Johns的缩孔形状法结合进去，形成了修正三次方程法，使计算结果准确；（2）实际中应用的经验性较强的热节圆法。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。