P(x)=\sum_{i=0}^{n}A_{i} \frac{(x-x_{0}) \cdot (x - x_{1}) \codt ... \cdot (x - x_{i-1})\cdot (x - x_{i + 1}) \cdot ... \cdot (x - x_{n})}{(x_{i} - x_{0})\cdot (x_{i} - x _{1}) \cdot ... \cdot (x_{i} - x_{i-1}) \cdot (x_{i} - x_{i+1})\cdot ... \cdor (x_{i} - x_{n})}