What is the rate of advance between kilometers and meters?

What is the rate of advance between kilometers and meters?

1000m = 1km advance rate 1000

Advance rate between meter, centimeter, decimeter, millimeter and kilometer

1km = 1000M
1 meter = 10 decimeters
1 decimeter = 10 cm
1 cm = 10 mm

The law of multiplicative distribution is a common tool. The calculation is 41.2 × 8.1 + 11 × 9.25 + 537 × 0.19

41.2×8.1+11×9.25+537×0.19，=333.72+101.75+102.03，=435.47+102.03，=537.5．

Y is inversely proportional to X. so y is inversely proportional to x, right?

It's not right
When y = K / x, y is inversely proportional to X
When the product of Y and X is fixed (k), they are inversely proportional. But when y and X & sup2; are inversely proportional (y = K / X & sup2;), the product of Y and X is K / x, which is not fixed, so y and X are not inversely proportional

Negative 1.4 times 1 and 1 out of 11, negative 5.5 times 4 out of 7?

Minus 1.4 times 1 / 11, minus 5.5 times 4 / 7 equals (- 7 / 5) * 12 / 11 * (- 11 / 2) * 4 / 7 = 24 / 5

If there are three elements in set a and two elements in set B, the maximum number of subsets of a ∪ B is?

This is not necessarily because we don't know whether there are common elements between set a and set B. if there are no common elements, then the subset of a ∪ B is 2 ^ 5 = 32
Finally, a formula is given. You can solve it according to this area. If there are n elements in the set, then the number of subsets of the set is 2 ^ n

1. The area of the top and bottom of the cone is π and 4 π respectively, and the side area is 6 π
I don't think it's the same answer. The answer is 7 √ 3 / 2 π
2. Triangle ABC, ab = 2, BC = 1.5, ∠ ABC = 120 degrees, rotating around BC for one circle, the volume of the rotating body is
This can come up with a graph. Let's talk about the idea. The answer is 3 π / 2
3. How many points on the circle x ^ 2 + y ^ 2 + 2x + 4y-3 = 0 to the straight line x + y + 1 = 0 whose distance is √ 2
4. If two circles intersect at points a (1,3), B (m, - 1), and the centers of the two circles are on the straight line X-Y + C = 0, then the value of M + C is
5. The linear equation of point (1, - 1) symmetry with line 2x + 3y-6 = 0 is
The answer is 2x + 3Y + 8 = 0
6. If the line x + y = 1 has no common point with the circle x ^ 2 + y ^ 2-2ay = 0 (a > 0), find the value range of A
√2-1)
7. If there is only one common point between the straight line y = x + B and the curve X = √ 1-y ^ 2, then the value range of B is

You know questions 5 and 8. I won't read them
2. Answer: radius of large cone = √ 3, height of large cone = 1.5 + 1 = 2.5; radius of small cone = √ 3, height of small cone = 1. Volume of large cone minus volume of small cone = (√ 3) ^ 2 (π) (2.5 ^ 2) / 3 - = (√ 3) ^ 2 (π) (1 ^ 2) / 3 = 3 π * 2.5 / 3-3 π / 3 = 1.5 π
A: three
x^2+y^2+2x+4y-3=0 ==> (x+1)^2+(y+2)^2=(2√2)^2
It is a circle with the center of (- 1, - 2) and the radius of 2 √ 2 in the third quadrant
Continuous column: x ^ 2 + y ^ 2 + 2x + 4y-3 = 0, x + Y-1 = 0 = = > x = 1, y = 0. This point is on the above circle and straight line. The slopes of two straight lines, x + y + 1 = 0 and X + Y-1 = 0 are - 1, and the distance between them is √ 2
The distance between the circle x ^ 2 + y ^ 2 + 2x + 4y-3 = 0 and the line x + y + 1 = 0 is √ 2. The other two points are on the lower left side of the line x + y + 1 = 0. Their coordinates can be obtained from the equation x ^ 2 + y ^ 2 + 2x + 4y-3 = 0, x + y + 2 = 0 = = > x ^ 2 + X - (7 / 2) = 0. The discriminant is: 1 + 4 (7 / 2) > 0 = = = > x ^ 2 + X - (7 / 2) = 0 has two real roots!
6. Answer: x + y = 1 = = > y = - x + 1 into x ^ 2 + y ^ 2-2ay = 0 = = > 2 (x ^ 2) + 2 (A-1) x + (1-2a) = 0
When the discriminant is: 4 (A-1) ^ 2-8 (1-2a) < 0, the quadratic equation 2 (x ^ 2) + 2 (A-1) x + (1-2a) = 0 has no real root, that is, the line x + y = 1 and the circle x ^ 2 + y ^ 2-2ay = 0 (a > 0) have no common point
4 (A-1) ^ 2 - 8 (1-2a) < 0 = = > A ^ 2 + 2a-1 < 0. Let a ^ 2 + 2a-1 = 0 = = > A1 = - 1 - √ 2, A2 = - 1 + √ 2
It can be seen that when - 1 - √ 2 < a < - 1 + √ 2, a ^ 2 + 2a-1 < 0 holds
Therefore, when a < - 1 + √ 2, the line x + y = 1 and the circle x ^ 2 + y ^ 2-2ay = 0 (a > 0) have no common point
7. Answer: the curve X = √ (1-y ^ 2) is a semicircle with the center of circle at (0,0) and radius of 1, which is in the first and fourth quadrants
When - 1

Which three different numbers add up to 7?
At least two groups
Except for zero and negative

1,2,4
0,3,4
In response to your supplementary question, I would like to:
Can it be a decimal, such as 1, 5, 3.5, 2
Or is the order of numbers different?
If it is a positive integer, it can only be 1,2,4; and 0 is a natural number

(3x + 2) + 7 = (X-7) * 4 calculate this equation

(3x+2)+7=(x-7)*4
3x+2+7=4x-28
4x-3x=9+28
x=37

1. Find the time of the nth coincidence of the hour hand and minute hand after 0 (0

1. The minute hand moves 6 ° per minute, and the hour hand moves 0.5 ° per minute. Suppose they meet for the nth time after X minutes, then there is 6 ° x = 360 ° n + 0.5 ° X
So x = 360 ° n / (5.5 °)
2. Let radius be r and arc length be L. then 2R + L = m, area s = 0.5lr = 0.5 (m-2r) r, and there is a maximum value when r = 1 / 4m, so the center angle of the circle is L / r = (m-0.5m) / (1 / 4m) = 2