数值积分算法实现对一阶微分方程组的计算：通过编写程序语言，运用欧拉，预报校正，龙格库塔的方法实现对x1微分=x2 x2微分=x3 x3微分=-800*x1-80*x2-24*x3+sin(t）； y=800x1 的运算-Numerical integration algorithm for the calculation of first-order differential equations: through the pre