积分的题目还是第一次做,直接用到了高数的知识,恩,还有,曲线的方程用顶点式y = a(x-h)^2+l, (h,l) 为顶点
注意精度问题
#include<stdio.h>
#include<math.h>
double x,y,x2,y2,x3,y3,area;
double l,h,a,k,b;
double f(double x)
{return (a*x*x*x/3)-(a*h+k/2)*x*x+(a*h*h+l-b)*x;}
int main()
{
int t;
scanf("%d",&t);
while(t--)
{
scanf("%lf%lf%lf%lf%lf%lf",&x,&y,&x2,&y2,&x3,&y3);
h=x;l=y;a=(y2-y)/((x2-x)*(x2-x));
k=(y3-y2)/(x3-x2);b=y2-k*x2;
printf("%.2lf\n",f(x3)-f(x2));
}
return 0;
}
转载于:https://www.cnblogs.com/nanke/archive/2011/07/30/2121704.html
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