做加法的

Our objective is not to grow, there is a saying : Haier is additive, 170,000 is subtraction.

我们的目的不是为了做大，有一种说法：海尔是加法，万科是减法。

We can use software to do most calculation but not use hardware. The most basic circuit doing calculation in the computer is binary adder. For example, we can use of addition to do subtracting, continuous adding to do multiplication, and continuous subtracting to do division.

在电脑的世界里，可以做任何数字系统且复杂的演算，但是大多数的演算都藉由软体来解决，而非用硬体直接进行各种演算，电脑的硬体或其他数位电路在做算术运算时，最基本的电路往往只有二进位加法器而已，至於减法可藉由补数的加法解决，乘法等於连续的加法，除法则是连续的减法，可见加法器在运算数位系统中的重要性。

Unlike the simple counting board used in elementary schools, very efficient suanpan techniques have been developed to do multiplication, division, addition, subtraction, square root and cube root operations at high speed.

不同于简单的计数在小学使用的电路板，非常有效的suanpan技术已经发展到这样做乘法，除法，加法，减法，平方根和立方根业务的高速增长。

Since the multiple scattering should be considered, the scattering problem of many-cylinders is more complicated than single cylinder. By using scattering matrix method to solve the scattering problem of many-cylinders, first we have to express the incident fieldand scattered field by special function（for example, Bessel function and Hankel function）under cylindrical coordinate, then use the addition theorem of special function to get a linear system of equations to relate the incident field coefficients and scattered field coefficients. The incident and scattered field coefficients for every cylinder can be solved from the linear equations by matching electromagnetic boundary condition pointwisely.

单颗圆柱散射体的散射场解析解很早就被解出，而多个圆柱阵列的散射场问题因为涉及到入射光在圆柱与圆柱间的多重散射，故散射行为较单颗圆柱的散射复杂，因此圆柱阵列的多重散射问题需要利用加法定理来处理；散射矩阵法的主要精神即是先用圆柱座标下的特殊函数对平面波和圆柱散射体的内外域电磁场做无穷级数展开，再藉由特殊函数的加法定理将所有圆柱散射体的展开中心移到同一个展开中心，最后可以得到一组连结整个散射系统的入射电磁场系数及散射电磁场系数的线性方程组，将该组线性方程配合电磁场在散射体边界的连续条件，便可分别求出圆柱阵列中各个圆柱体的内部电磁场与外部散射场，再利用线性叠加原理即可求得整个圆柱系统的全域电磁场分布。

What French mathematician built and sold the first gear-driven mechanical machine that did addition and subtraction?

全句译：什麼是法国数学家建造并销售的第一部能做加法和减法的机械齿轮驱动装置？

For addition and subtraction I'm not trying to do any fancy conversion.

对于加法和减法，我不会尝试去做一些奇特的转换。

Tsinghua undergrads are fortunate in that more and more your university is encouraging teamwork in your case work stimulating the transition from "me" to "we".

今天我应邀向各位交流一下我对由&我&思维转为&我们&思维的看法。我的观点很简单，我认为个人做的是加法，而集体做的是乘法。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。