The polar coordinate equation ρ = 4cos θ is transformed into rectangular coordinate equation () A. （x-2）2+y2=4B. x2+y2=4C. x2+（y-2）2=4D. （x-1）2+（y-1）2=4

The polar coordinate equation ρ = 4cos θ is transformed into rectangular coordinate equation () A. （x-2）2+y2=4B. x2+y2=4C. x2+（y-2）2=4D. （x-1）2+（y-1）2=4

The original polar coordinate equation ρ = 4cos θ is changed into: ρ 2 = 4 ρcos θ, and the rectangular coordinate equation is changed into: x2 + y2-4x = 0, that is, Y2 + (X-2) 2 = 4

The polar coordinate equation of curve C is ρ = 2cos θ + 6cos θ. Change the polar coordinate equation of curve C into linear coordinate equation (specific steps)

Multiply ρ on both sides to get; X & # 178; + Y & # 178; = 2x + 6y, that is, (x-1) &# 178; + (Y-3) &# 178; = 10

, ρ = 4sin θ is the polar coordinate equation of circle C. how to get that the center of the circle is (0,2)

ρ=4sinθ
ρ^2=4ρsinθ
x^2+y^2=4y
x^2+(y-2)^2=4
The center of the circle is (0,2)

Given that the polar coordinate equation of circle C is ρ = - 4sin θ + cos θ, then the rectangular coordinate equation of circle C is______ The rectangular coordinates of the center of the circle are______ ．

The polar coordinate equation of circle C is ρ = - 4sin θ + cos θ, that is, ρ 2 = - 4 ρ sin θ + 4 ρ cos θ. According to the formula of polar coordinates and rectangular coordinates, we can get x2 + y2 = - 4Y + X, that is, X2 + y2-x + 4Y = 0

A positive rational number can be represented by a point on the edge of the origin, a negative rational number can be represented by a point on the edge of the number axis, and a zero can be represented by a?
Please

Right
Left
origin

How many units of length is the distance from the origin of the negative five points on the number axis, and how many points are five units of length away from the origin on the number axis, and how many numbers they represent. Xiaoying, at a certain intersection, stipulates that the east direction is positive and the west direction is negative. If Xiaoying walks 180 meters eastward and 180 meters westward, how many meters is she from the intersection, and what is the actual significance, If Xiaoying walks 80 meters west and 150 meters east, how many meters away is she from the intersection at this time? Affected by the strong cold air, the temperature drops by two degrees every hour from 5:00 p.m. to 4:00 a.m., and how much does the temperature drop at 10:00 p.m. compared with that at 5:00 p.m. in the evening, Use a formula to show why

5,4, + 5-5 + 5-5,0, Xiaoying didn't leave the intersection, 70 meters, 10 degrees, 26 degrees, - 26 ℃

1. The point of negative five on the number axis is the distance between the origin side and the origin in units of length, positive two points one
1. On the number axis, the distance between the point of negative five and the origin is unit length, and the distance between the point of positive two and one and the origin is unit length. 2. If point a represents the number of negative three and point B represents the number of 7, then the distance between points AB is unit length

1. The point of negative five on the number axis is on the left side of the origin, which is 5 unit length away from the origin, and the point of positive two and one is on the right side of the origin, which is 2.1 unit length away from the origin
2. If point a is negative three and point B is 7, then the distance between points AB is 10 unit length

The distance between a and B points on the number axis from the origin is 2 and 3 respectively, then the distance between ab points is______ ．

∵ the distance between a and B points on the number axis from the origin is 2 and 3 respectively. We can get that point a represents ± 2 and point B represents ± 3. When points a and B are on the same side of the origin, ab = | 3-2 | = 1; when points a and B are on different sides of the origin, ab = | - 2-3 | = 5

If the distance between point a and the origin on the number axis is 4, and the distance between point B and the origin is 2, then the distance between two points AB is 2

6
two

On the number axis, it is known that a is at two unit lengths on the left side of B; C and D are on the left side of the origin, and the distance to the origin is equal; E and F are reciprocal
|A-B | + 1 / 20 (c + D-20) EF 5 / 20

A is two unit lengths to the left of B: B-A = 2
|A-B | + 1 / 20
=2+1/20
=2.05
C and D should be on the left and right sides of the origin, and the distance to the origin is equal, otherwise C + D can not calculate the specific value
C + D = 0
E and F are reciprocal: e * f = 1
(c + D-20) 5 / ef
=(0-20)*5/1
=-20*5
=-100