复数算术推导了正弦，余弦的加法公式。
We derive the addition formulas for sine and cosine from the arithmetic of complex numbers.
给出了条件概率的加法公式、乘法公式和一般的全概率公式。
Some formulas on conditional probability were established and a generalized total probability formula was given.
在求解概率问题时，掌握逆事件公式与加法公式的运用，会使问题变得简单。但是应根据问题实质，灵活运用，避免盲目与机械。
It can help easily solve the probability problem to master inverse-event formula and plus formula. Yet the formulas should be utilized flexibly not blindly.
采用正弦和余弦的泰勒展开式构造的迭代公式，计算一个绘图点只需9次加法。
Adopt the iterative formula that forms Taylor's expansion of sine and cosine, and compute a graphic points are only calculated by 9 times addition.
应用数学方法研究离子电极测量技术中的等电势标准添加法，推导出新的计算公式。
A new identical Potentiometric standard addition method with ion-selective electrodes and its computation formulas are derived by mathematical method.
勃郎特-维西克研究的条形基础极限承载力属于平面应变问题，采用分步叠加法，求得地基极限承载力公式。
Prandtl-Vesic of ultimate bearing capacity of strip foundation belongs to the plane strain problems, which adopt step superposition method to obtain the formula of ultimate bearing capacity.
勃郎特-维西克研究的条形基础极限承载力属于平面应变问题，采用分步叠加法，求得地基极限承载力公式。
Prandtl-Vesic of ultimate bearing capacity of strip foundation belongs to the plane strain problems, which adopt step superposition method to obtain the formula of ultimate bearing capacity.
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