Add source code of Lesson 1

Bai thuc hanh so 1/bai1.cpp

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+#include <iostream>
+
+using namespace std;
+
+int main(){
+  int a,b;
+  cout << "Nhap so nguyen a: ";
+  cin >> a;
+  cout << "Nhap so nguyen b: ";
+  cin >> b;
+  int tong=a+b;
+  int hieu=a-b;
+  int tich=a*b;
+  int thuong=a/b;
+  int du=a%b;
+  cout << "Tong cua 2 so nguyen " << a << " va " << b << " la: " << tong << "\n";
+  cout << "Hieu cua 2 so nguyen " << a << " va " << b << " la: " << hieu << "\n";
+  cout << "Tich cua 2 so nguyen " << a << " va " << b << " la: " << tich << "\n";
+  cout << "Thuong cua phep chia 2 so nguyen " << a << " va " << b << " la: " << thuong << "\n";
+  cout << "Du cua phep chia 2 so nguyen " << a << " va " << b << " la: " << du << "\n";
+  return 0;
+}

Bai thuc hanh so 1/bai2.cpp

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+#include <iostream>
+
+using namespace std;
+
+int main(){
+  int n;
+  cout << "Nhap mot so nguyen co it hon 5 chu so: ";
+  cin >> n;
+  int N = n/1000;
+  int T = (n%1000)/100;
+  int C = (n%100)/10;
+  int D = n%10;
+  cout << N << " nghin " << T << " tram " << C << " chuc " << D << " don vi.\n";
+  return 0;
+}

Bai thuc hanh so 1/bai3.cpp

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+#include <iostream>
+#include <math.h>
+
+using namespace std;
+
+int main(){
+  int x;
+  cout << "Nhap vao so nguyen x: ";
+  cin >> x;
+  float f = (x*x+exp(abs(x))+sin(x)*sin(x))/pow(x*x+1,1.0/5);
+  cout << "f(x) = " << f << "\n";
+  return 0;
+}

Bai thuc hanh so 1/bai4.cpp

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+#include <iostream>
+#include <math.h>
+
+using namespace std;
+
+int main(){
+  int x1,x2,y1,y2;
+  cout << "Nhap toa do diem A: ";
+  cin >> x1 >> y1;
+  cout << "Nhap toa do diem B: ";
+  cin >> x2 >> y2;
+  float D = sqrt(pow(x2-x1,2)+pow(y2-y1,2));
+  float M = abs(x2-x1)+abs(y2-y1);
+  float C = 1-((x1*x2+y1*y2)/(sqrt(x1*x1+y1*y1)*sqrt(x2*x2+y2*y2)));
+  cout << "Giua A(" << x1 << "," << y1 << ") va B(" << x2 << "," << y2 << "):\n";
+  cout << "- Khoang cach Euclidean la: " << D << "\n";
+  cout << "- Khoang cach Manhattan la: " << M << "\n";
+  cout << "- Khoang cach Cosin la: " << C << "\n";
+  return 0;
+ }

Bai thuc hanh so 1/bai5.cpp

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+#include <iostream>
+#include <math.h>
+
+using namespace std;
+
+int main(){
+  int x1,x2,x3,y1,y2,y3;
+  cout << "Nhap toa do diem A: ";
+  cin >> x1 >> y1;
+  cout << "Nhap toa do diem B: ";
+  cin >> x2 >> y2;
+  cout << "Nhap toa do diem C: ";
+  cin >> x3 >> y3;
+  float x = (x1+x2+x3)/3;
+  float y = (y1+y2+y3)/3;
+  float inter = sqrt(pow(x1-x,2)+pow(y1-y,2))+sqrt(pow(x2-x,2)+pow(y2-y,2))+sqrt(pow(x3-x,2)+pow(y3-y,2));
+  cout << "Inter = " << inter << "\n";
+  return 0;
+}