Let the mean of a, B, C be m, the mean of a, B be n, and the mean of C be p. if a > b > C, then the relationship between M and P is () A. M = Pb. M > PC. m < PD. Uncertainty

Let the mean of a, B, C be m, the mean of a, B be n, and the mean of C be p. if a > b > C, then the relationship between M and P is () A. M = Pb. M > PC. m < PD. Uncertainty

From the meaning of the title: a + B + C = 3M, a + B = 2n, N + C = 2p; m = a + B + C3, P = n + C2, n = a + B2; substituting n into P, we can get: P = a + B + 2C4; M-P = a + B − 2C12; and ∵ a > b > C, ∵ a + B + C > 3C, ∵ M-P > 0, ∵ m > p; so we choose B

It is known that the perimeter of a pentagonal ABCDE is 2000 meters. A and B start from a and C at the same time, and follow a → B → C → D → e → a → When walking around the square, the speed of a is 50 m / min, and that of B is 46 M / min. how many minutes after starting, a and B start walking on the same side for the first time

The perimeter of the pentagonal ABCDE is 2000 meters, and the side length is 400 meters. After X minutes, both a and B are at the top of the pentagonal and start to walk on the same side for the first time. 50x-46x = 400, the solution is x = 100 200 meters, 200 meters to the Pentagon

1.2 (x-2y) & #178; - 4 (x-2y) + (x-2y) & #178; - 3 (x-2y), where x = - 1, y = 1 / 2
2. If the value of polynomial (2mx & # 178; - y + 5x + 8) - (X & # 178; - 3Y + 5x) is independent of X, find the value of algebraic formula M & # 178; - (2m & # 178; - (5m-4) + M
3. Given that the difference between the polynomial 3x & # 178; + my-8 and the polynomial NX & # 178; + 2Y + 7 does not contain X and y, find the value of n ^ m + Mn
Please, brother, teach me the steps of the formula
The first question is to simplify before evaluating.

3(x-2y）²-7（x-2y）=(x-2y)(3x-6y-7)=0
m=1/2
m²-（2m²-（5m-4）+m）=-9/4
n=-3,m=2
n^m+mn=-8-6=-14

Find the rules and fill in the blanks! 1 / 2, 3 / 5, 8 / 11, 9 / 23, find the next number!

42/47
The fourth number should be 19 / 23, right?
If not, I don't know

How many multiples of 7 are there in natural numbers less than 100? And are they?
That's the first question! Let a * b = 3b-2a, then what is 5 * (x * 4) x equal to?
Third question:

100/7=14…… two
There are 14 multiples of seven
7+14+21+...+98
=（7+98）*14/2
=735

As shown in the figure, when the car accelerates to the right, the block m is stationary on the vertical wall of the car relative to the car. When the car's acceleration increases ()
A. M's static friction increases, B. M's pressure on the car wall increases, C. m may fall onto the car, D. M's static friction remains unchanged

A. according to Newton's second law, the friction force F = mg remains unchanged. So a is wrong and D is correct. When the acceleration of B and C cars increases, the elastic force n = ma increases, and the maximum static friction force on the block increases. The block cannot slide along the wall. So B is correct and C is wrong. So BD is selected

Find the rule and fill in the number. 6.67.7 () 8.89.9 ()

6.6 7.7 ( 6) 8.8 9.9 ( 9)

The sum of two adjacent even numbers is 74. What are the two even numbers?
There are also a group of chickens and rabbits living in the same cage, the number of equal, a total of 120 legs?
The height of a sapling is 55cm, and it grows 5cm every month. A few months later, the height of the sapling section chief is 1m?
All questions need to be answered
I want an equation. I want an unknown number and an equation

The sum of two adjacent even numbers is 74. What are the two even numbers?
（74＋2）÷2＝38
74－38＝36
There are also a group of chickens and rabbits living in the same cage, the number of equal, a total of 120 legs?
120 (2 + 4) = 20 (pieces)
The height of a sapling is 55cm, and it grows 5cm every month. A few months later, the height of the sapling section chief is 1m?
1m = 100cm
(100-55) △ 5 = 9

If a is the n-th root of B, then - a must be the n-th root of - B

Not necessarily
for instance
The power of 4 = 2
And the second power of (- 2) = 4 is not equal to (- 4)

204-36 = 168 8x26 = 204 144 △ 4 = 36 comprehensive formula

（8×26-36-24）÷4=36
You should give a step less, and the order is not right
Should be:
8x26=204 204-36=168 168-24=144 144÷4=36
Or you can:
8×26 -144÷4 = 168
But the order you gave is also wrong. It should be 8x26 = 204 144 △ 4 = 36 204-36 = 168