说明：  使用最小二乘法的一次性计算公式来估计y(i) = b0 + b1 * x + b2 * x^2 + b3 * x^3 + ...... bn * x^n中b0, b1, ..., bn的值,并显示你和的曲线.
(use of least squares method of the one-time formula to estimate y (i) = b0 b1 b2* x* x ^ 2 b x ^ 3* 3* ...... bn x ^ n b0, b1, ..., bn value, and show you and the curve.)