纯数学题，定积分。
#include <iostream> #include <iomanip> using namespace std; int main() { double x1, x2, x3, y1, y2, y3, k, h; int T, i; cin >> T; while (T--) { cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3; k = (y2 - y3) / (x2 - x3); h = y2 - k*x2; double a, b, c; a = (y2 - y1) / ((x2 - x1)*(x2 - x1)); b = -2 * a*x1; c = y1 - a*x1*x1 - b*x1; double sum; sum = a / 3 * (x3*x3*x3 - x2*x2*x2) + (b - k) / 2 * (x3*x3 - x2*x2) + (c - h)*(x3 - x2); cout << fixed << setprecision(2) << sum << endl; } return 0; }继续加油。
