题号 3-1
//二元一次方程组求解
#include<stdio.h>
int main()
{
double a, b, c, d, e, f;
double delta, tmp, x, y;
scanf("%lf%lf%lf%lf%lf%lf", &a, &b, &c, &d, &e, &f);
delta = a * d - b * c;
tmp = delta - 0;
if(tmp < 0)//为避免判断方程无根时进一步判断负号，先做统一处理
tmp = -tmp;
if (tmp < 1e-6)//判断方程是分母是否为0，接近0则认为无解
printf("方程无解");
else
{
x = (e * d - b * f) / delta;
y = (a * f - e * c) / delta;
printf("x = %.2lf, y = %.2lf", x, y);
}
return 0;
}
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