... elems[(row - 1)*cols + (col - 1)]: dummy; }void main() { Matrix m(3 ,2) ; m(1,1) = 10; m(1 ,2) = 20 ; m (2, 1) = 30; m (2, 2) = 40; m(3,1) = 50; m(3 ,2) = 60; cout<<m<<endl;} Chương ... }Point operator - (Point &p) { return Point(x - p.x, y - p.y); } private:int x, y;};void main() { Point p1(10 ,20 ), p2(10 ,20 ); Point p3 = p1 + p2; Point p4 = p1 - p2; Point p5 = p3.operator ... operator - (Point &p, Point &q) {return Point(p.x - q.x,p.y - q.y); } private:int x, y;};void main() { Point p1(10 ,20 ), p2(10 ,20 ); Point p3 = p1 + p2; Point p4 = p1 - p2; Point...