For instance, in order to use the quadratic formula you must have the quadratic in standard form first.
例如，为了使用二次方程式，你需要知道标准的二次平方式。
Accordingly, the first-order modified formula for transmitted intermediate points and refracted points is derived and whole ray-path can be computed for refracted ray iteratively segment by segment.
据此即可分别推导出透射中间点和折射点的一阶修正公式，进行折射线逐段迭代计算求出整条射线路径。
Nonlinear directly estimating formula for exponential curve which, through fixed point, was derived, by using first order approximation of Taylor expansion.
运用泰勒展开的一阶近似估计推导过定点的指数曲线的非线性直接估计公式。
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