Cho hai đa thức P(x) = x3 - 2.x+1 Q(x) = 2.x2-x3 + x -3.
a)Tính P(x) + Q(x) và P(x) - Q(x)
b)Tính giá trị của đa thức P(x) + Q(x) tại x = -1; x = 3

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Axel follows these steps to divide 40 by 9: start with 40. 1. divide by 9 and write down the remainder. 2. write a zero after the remainder. 3. repeat steps 1 and 2 until you have a remainder of zero. examine his work, and then complete the statements below.

On traditional maps, earth is represented in a flat plane, or by euclidean geometry. however, a globe is a more accurate model that comes from elliptical geometry. how does a globe represent the fact that there are no parallel lines in elliptical geometry? the equator is not parallel to any other latitudinal lines. the north and south poles are never connected by a geodesic. the geodesics connecting the north and south poles never intersect. the geodesics connecting the north and south poles intersect at both of the poles.