The linear equation of two variables x-3y = 0 3x-3y = 4

The linear equation of two variables x-3y = 0 3x-3y = 4

x=2,y=2/3

Given 3x-5y = 0, then the value of fraction x − 2yx + 3Y is______ ．

∵ 3x-5y = 0, ∵ x = 5y3, ∵ original formula = 5y3 − 2y5y3 + 3Y = - 111

[3x+2y+z=14,x+y+z=10,2x+3y-z=1]

3x+2y+z=14.(1)
x+y+z=10.(2)
2x+3y-z=1.(3)
Solutions (1) - (2) are obtained
2x+y=4.(4)
(2) + (3) get
3x+4y=11.(5)
4 * (4) - (5)
5x=5
x=1
Substituting x = 1 into (4)
y=2
Substituting x = 1, y = 2 into (2)
z=7
The solution is. X = 1, y = 2, z = 7

Simplification: (2a-b-c) / (a-b) (A-C) + (2b-c-a) / (B-C) (B-A) + (2c-a-b) / (C-A) (C-B)

The original formula = [(a-b) + (A-C)] / (a-b) (A-C) + [(B-C) + (B-A)] / (B-C) (B-A) + [(C-A) + (C-B)] / (C-A) (C-B)
=1/(a-c)+1/(a-b)+1/(b-a)+1/(b-c)+1/(c-b)+1/(c-a)
=0

2 / 7 of this pile of apples are transported in 4 times. How many parts of this pile of apples are transported in 7 times

How many parts of the pile of apples are transported away at a time
2/7÷4=1/14
According to this calculation, how many are transported in seven times
1/14×7=1/2

What are the conditions for the three variable mean inequality
Let's not say that ABC is a non negative real number, for example, when the root of the third power (ABC) and (a + B + C) / 3 hold, because it's obvious that we want to be specific, such as how about the ABC product

I see what you mean
1. When a + B + C is constant, the maximum value of the root of the third power (ABC) is (a + B + C) / 3 (if and only if a = b = C is equal sign)
2. When ABC is a fixed value, (a + B + C) / 3 has the minimum value of cubic root (ABC)
Then, if you have any questions, just say

A. The distance between B and a is 360km. A and B start from a and B at the same time and run towards each other. After 4h, they meet. The speed of a is 50km / h, and the speed of B is calculated

Let B's speed be XKM / h, then 50 × 4 + 4x = 360, and the solution is x = 40. A: B's speed is 40km / h

If the solution set of inequality 1 / 3 (x-m) greater than 2-m is x greater than 2, then the value of M is -——

1 / 3 (x-m) greater than 2-m
(1/3)X-(1/3)M>2-M
(1/3)X>2-(2/3)M
X>6-2M
X>2
6-2M=2
M=2

The railway from Tianjin to Jinan is 358 kilometers long. A passenger train and a freight train run from both places at the same time. Two hours later, they meet on the way,
It is known that the passenger car travels 120 kilometers per hour, and the freight car travels how many kilometers per hour

A freight car is set to travel x kilometers per hour
120×2+2x=358
2x=118
x=59
A: trucks travel 59 kilometers per hour

Given that the function f (x) = CX / (2x + 3) (x is not equal to - 3 / 2) satisfies f [f (x)] = x, find the value of real number C

F [f (x)] = C * [CX / (2x + 3)] / [(2cx / (2x + 3) + 3] = x, where 3 = (6x + 9) / (2x + 3) ze f [f (x)] = C ^ 2 [x / (2x + 3)] / [(2cx + 6x + 9) / [(2x + 3)] = C ^ 2 * x / (2cx + 6x + 9) = x, we get C ^ 2 / (2cx + 6x + 9) = 1. Due to the condition that x is not equal to - 3 / 2, that is, if and only if x equals to - 3 / 2, f [f (x)]