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// bai 1 #include <iostream> #include <iomanip> using namespace std; int main() { int soNguyen; float soThuc; char kyTu; cout << "Nhap vao:\n"; cin >> soNguyen >> soThuc >> kyTu; cout << fixed << setprecision(2) << (float)soNguyen + soThuc << endl; cout << (int)soThuc * soNguyen << endl; int c = (int)kyTu; cout << fixed << setprecision(2) << (c + soNguyen + soThuc) / 3 << endl; return 0; } // bai 2 #include <iostream> #include <math.h> using namespace std; int main() { int x1, y1, x2, y2, x3, y3, x, y; cout << "Nhap toa do diem A\n"; cin >> x1 >> y1; cout << "Nhap toa do diem B\n"; cin >> x2 >> y2; cout << "Nhap toa do diem B\n"; cin >> x3 >> x3; cout << "Nhap toa do diem P\n"; cin >> x >> y; double dienTich = fabs(x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2; double dienTich1 = fabs(x1 * (y2 - y) + x2 * (y - y1) + x * (y1 - y2)) / 2; double dienTich2 = fabs(x2 * (y3 - y) + x3 * (y - y2) + x * (y2 - y3)) / 2; double dienTich3 = fabs(x3 * (y1 - y) + x1 * (y - y3) + x * (y3 - y1)) / 2; double S = dienTich1 + dienTich2 + dienTich3; if (dienTich == S) cout << "Diem P nam trong tam giac ABC" << endl; else cout << "Diem P khong nam trong tam giac ABC" << endl; return 0; } // bai 3 #include <iostream> #include <iomanip> using namespace std; int main() { int h, p, s; cin >> h >> p >> s; if (h < 0 || h > 24 || p < 0 || p > 60 || s < 0 || s > 60) { cout << "Loi" << endl; return 0; } else { int H = h, P = p, S = s; if (s == 0) { S = 59; if (p == 0) { P = 59; if (h == 0) { H = 23; } else { H--; } } else { P--; } } else { S--; } int t = h, m = p, n = s; if (s == 59) { n = 0; if (p == 59) { m = 0; if (h == 23) { t = 0; } else { t++; } } else { m++; } } else { n++; } cout << setw(2) << setfill('0') << H << ":" << setw(2) << setfill('0') << P << ":" << setw(2) << setfill('0') << S << endl; cout << setw(2) << setfill('0') << h << ":" << setw(2) << setfill('0') << p << ":" << setw(2) << setfill('0') << s << endl; cout << setw(2) << setfill('0') << t << ":" << setw(2) << setfill('0') << m << ":" << setw(2) << setfill('0') << n << endl; } } // bai 4 #include <iostream> #include <iomanip> using namespace std; int main() { int soDien; cout << "Nhap so dien\n"; cin >> soDien; long long thanhTien = 0; if (soDien <= 50) thanhTien = soDien * 1678; else if (soDien >= 51 && soDien <= 100) thanhTien = (soDien - 50) * 1734 + 50 * 1678; else if (soDien >= 101 && soDien <= 200) thanhTien = (soDien - 100) * 2014 + 50 * 1734 + 50 * 1678; else if (soDien >= 201 && soDien <= 300) thanhTien = (soDien - 200) * 2536 + 100 * 2014 + 50 * 1734 + 50 * 1678; else (soDien - 300) * 2927 + 1000 * 2536 + 100 * 2014 + 50 * 1734 + 50 * 1678; cout << thanhTien << endl; }
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