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The sums may be from any one or combination of the following topics: pre-algebra, algebraic expressions, algebraic expansion (multiplication of binomials and trinomials), algebraic factors, simple equations,simultaneous equations and quadratic equations.

数学试题可能来自于下列主题之一或者其组合：学龄前数学，数学表达式，代数表达式，代数因数，简单等式，联立方程式和二次方程式。

In this research,Young buddings of Clone SCATC 7-33-97 were used as plant materials,adopting to the quadratic general rotary unitized design,with nitrogen,phosphor,potassium,magnesium these four factors with 5 levels(1/2 implement) for fertilizer experiment.

本研究以橡胶幼苗无性系热研7-33-97为试验材料，采用二次回归通用旋转设计安排了氮、磷、钾、镁肥四因素5水平(1/2实施)的肥料试验。

In chapter 2, we discuss the single food chain Chemostat models with constant consumption rate. We first assume that the increase rate is in direct proportion, and then we discuss the model with quadratic saturated increase rate.

第二章主要研究了消耗率为常数的情况下正比增长率的食物链模型以及二重饱和增长模型。

Corni. On the best coordination basis of 3 factors of extracting time, extracting temperature and solid-liquid ratio, the orthogonal combination of design of quadratic regression was tested by selecting 2 factors of alcohol amount and precipitation time, and optimization on technology parameters of polysaccharide extraction from F. Corni was conducted for two times.

方法］在山茱萸多糖提取时间、提取温度和料液比3个因素最佳配合的基础上，选取酒精用量、沉淀时间2个因素进行二次回归正交组合设计试验，用响应面法对山茱萸多糖提取工艺参数进行了两次优化。

Analysis indicates that the adjacent channel power is a quadratic function of predistorter efficients. A new optimization method is given which uses the predicted ACP surface to obtain fast convergence and simulation results show that a 20dB reduction in the third IMD and a 10dB reduction in the quatic IMD are achievable.

得出结论为：分析表明功放输出的邻信道功率是预失真器系数的二次函数；利用了新的自适应算法即使用预测的ACP曲面以提供更快的收敛速度；仿真结果表明，3阶产物可获得20dB以上的改善，5阶产物可获得10dB以上的改善。

The paper gives stiffness matrix and mass matrix in finite element analysis of the ground vibration problem caused by track traffic by using three-dimension finite element method. Because three-dimension finite element analysis is very difficult, it is transmitted into a quadratic programming, which can be calculated by neural network.

本文融合神经网络技术和遗传算法，对轨道交通引起的地面振动进行了正分析和反演，并利用计算机技术实现了地面振动的三维动画模拟，这主要包括：(1)研究了压缩映射遗传算法，利用Banach空间的不动点定理证明了压缩映射遗传算法可以收敛到全局最优值，弥补了标准遗传算法不能收敛至全局最优值的不足。

In order to simulated the characteristics of dynamic regression of saturated sandy soil under cyclic loading, the relation between the real hysteresis loop and the one indicated by the Masing rule is discussed based on a series of laboratory test, the modified proportion coefficient of hysteresis loop simulated by the Masing rule indicating by the stress history is determined, and then, it is modified by a quadratic function.

为了描述周期荷载作用下饱和砂土的动力衰减特性，试验研究了周期荷载条件下不同剪应变幅值时的实际滞回圈与由曼辛法则确定的滞回圈之间的关系，给出了由应变历史表示的用曼辛法则描述的滞回圈的比例修正系数，进而用二次函数进行了修正。

A Landsat 7 ETM(superscript +) image of Nanjing was used to derive normalized difference vegetation index after atmospheric correction. Regressed NDVI with VFC from ground measurement, linear, quadratic, cubic, and quartic polynomial models were established.

文章选用南京市一幅Landsat7ETM图像，经大气校正后提取了归一化植被指数，与地面实测的植被覆盖度进行回归分析，建立了1~4次多项式关系模型。

Nine substances containing hydrocarbon, alcohol, ketone, ester, water and 18 systems of isothermal VLE date have been calculated and the results show that using the quadratic functional local composition mixing rule the precision of vapor composition and pressure calculation is better than by using temperature mixing rule.

结果表明，二次形局部组成混合规则优于温度函数混合规则，对于丙酮-水、乙醇-水、甲醇-水及苯-丙醇体系计算气相组成与压力精度均有明显提高。

Based on the optimum quadratic performance index, the optimum guidance law is deduced to make sure the landing velocity and angle of warhead.

基于常值最优二次型指标推导得到了对弹头落地速度以及落地角度有所保证的最优制导律。

We will see more and more activist government policies that distinguish economic activities according to the nationality of the actors.

我们将看到越来越多激进的政府政策，这些政策根据企业的国籍来区分经济活动。

If we can prove the independence of an axiomatic system, then we can guarantee the conciseness of this system, ie.

如果能够证明某个一阶谓词系统的独立性，那么就能够保证该系统的建立是精炼的，即没有任何一条公理或推理规则是多余的。