To simplify fractional rational expression, it is necessary to make arithmetic actions in a certain order. At first operations in brackets, then multiplication and division and in the last turn – addition and subtraction are performed. The numerator and a denominator of initial fractions usually display on multipliers since during the solution of an example they can be reduced.

The mass of tasks is on the basis of properties of polyhedrons. Sides of volume figures, as well as concrete points on them, lie in the different planes. If to carry out one of such planes under a certain corner through a parallelepiped, then the part of the plane lying within a polyhedron and dividing it into parts will be its section.

The vector is the directed piece which consists of couple of points. A point – the beginning of a vector, and B point – its end. In the drawing the vector is represented as a piece which has an arrow on the end.

The concept of a root from the fourth degree can be considered on the example of the look equation: x*x*x*x=y. A fourth root from number y is x. From this equation it is visible that the number from which the root is taken cannot be negative. The root from zero gives zero. To find x it is possible in several ways.