(代数:求解 2 x 2 线性方程)可以使用Cramer规则解下面的 2 x 2 线性方程组:
ax + by = e ed - bf af - ec
x = ——————— y = ————————
cx + dy = f ad - bc ad - bc
编写程序,求解以下方程组并显示x和y的值。
3.4x + 50.2y = 44.5
2.1x + 0.55y = 5.9
/*
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package dome1_13;
/**
*
* @author Administrator
*/
public class Dome1_13 {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
double x = (44.5 * 0.55 - 50.2 * 5.9) / (3.4 * 0.55 - 50.2 * 2.1);
System.out.println(x);
double y = (3.4 * 5.9 - 44.5 * 2.1) / (3.4 * 0.55 - 50.2 * 2.1);
System.out.println(y);
}
}