Дано

визначення класів:

class C1 {

  public:

           void

aPolymorphMethod();           //

           virtual

void aVirtualMethod() = 0; //

};

class C2: public C1 {

  public:

           virtual

void aVirtualMethod();     //

};

void C1::aPolymorphMethod()

{ 

aVirtualMethod();

}

void C2::aVirtualMethod(){}

      Чому в класі С1 повинен бути метод aVirtualMethod ?   Відповідь пояснити.

Given the differential equation (E):

Using the constant variation method, Look for the solutions of (E) of the form:

The solutions of the differential equation are

Given the differetnial equation (E):

Given the function defined by

the function is solution of the differential equation

Given the differential equation (E):

This equation has a particular solution of the form "first degree polynomial exp(2x)"

Given the differential equation (E):

Given the differential equation (H) :

Let be any solution of the equation.