线性回归，用来进行天气。股票的预测分为一元和多元预测-linear regression, used to the weather. The forecast into the stock one dollar and the yuan forecast

解1至5元线性方程组。。 如解2元线性方程组时，只需在前两个方程中的x1，x2前输入系数，在最后一列前两个框输入2个常数项即可。其它多元方程组依次类推-1 to 5 yuan solution of linear equations... Such as 2 yuan solution of linear equations, just in the first two in the equations are x1, before the x2 input coefficient, in th