It is known that X and y satisfy the inequality 5x-27-3 / 2 y respectively. Try to compare the size relation of X and y

It is known that X and y satisfy the inequality 5x-27-3 / 2 y respectively. Try to compare the size relation of X and y

5X-24
Y> X because x
Solve the inequality {5x-2 is less than 3 (X-2) {half X-5 is greater than or equal to 1-half X
5x-2
1 find the integer solution of the inequality {2x-1 / 3 minus 5x + 1 / 2 ≤ 1,5x-1 < 3 (x + 1)
2-solution inequality system {X-1 / 2 minus X / 3 plus 1 ＞ 0,4x-3 ≤ 5 + 2x, 2 minus 5 + X / 7 ＞ 1 minus 1-x / 14}
1: The solution of the system of inequalities is x ≤ (7-radical 74) / 10 or ≤ (7 + radical 74) / 10 ≤ X
If the absolute value of X - 5 is equal to 5 - x, what is the value range of X
|x-5|=5-x=-(x-5)
So X-5 ≤ 0
x≤5
The absolute value of X-5 is equal to 5-x
∴5-x≥0
∴x≤5
Three physics problems, formula,
1. The mass of a part's wood mold is 200g. How many kg of iron is needed to make 30 castings of this part by using the sand casting technology? (density of wood: 600kg / m3, density of iron: 7900kg / m3)
2. The total mass of a container filled with water is 450g. If 150g pebbles are put into the container and then weighed after overflowing water, the total mass is 550G. How large is the volume of pebbles? What is the density of pebbles?
3. The total mass of an empty cup filled with water is 500g. Put a small block into the water, and after the water overflows, the total mass is 800g. Finally, take out the block, and the total mass of the remaining part is 200g. What is the density of the block?
It is known that: ρ wood = 600kg / m3, m wood = 200g = 0.2kg; V wood ρ = m / v = > V wood = m / ρ = 0.2 / 600m3 =. M3 is obtained from the title; V iron = V wood =... M3m iron = ρ. V = 7900 ×... KGM total = m iron × n iron = 30 ×... Kg =... Kg (2) solution; m drainage = m front - (M rear)
It is proved that a (a + 1) (a + 2) (a + 3) + 1 is a complete square form
∵ a (a + 1) (a + 2) (a + 3) + 1 = (A2 + 3a) [(A2 + 3a) + 2] + 1 = (A2 + 3a) 2 + 2 (A2 + 3a) + 1 = (A2 + 3A + 1) 2, ∵ a (a + 1) (a + 2) (a + 3) + 1 is a complete square
When m is the value, the solution of the equation 5x-2m = 4x-1 is 3 / 1 of the solution of 2x-3m = X?
The solution is x = 2m-1 from 5x-2m = 4x-1
From 2x-3m = x to x = 3M
Because the solution of the equation 5x-2m = 4x-1 is 3 / 1 of the solution of 2x-3m = X
So 2m-1 = M
So m = 1
Let u = R, a = {x | x ＞ 1}, B = {x | x + a ＜ 0}, B ⊆∁ RA, then the value range of real number a is______ .
∵ a = {x | x ＞ 1}, ∁ RA = {x | x ≤ 1}, and ∵ B = {x | x + a ＜ 0} = {x | x ＜ - a}, B ⊆ RA, ∁ a ≤ 1, that is, a ≥ - 1, so the value range of real number a is [- 1, + ∞), so the answer is: [- 1, + ∞)
If the absolute value x-a + 1 / X is greater than or equal to 1 / 2 for all x greater than 0, then the value range of a is?
▏ x-a + 1 / X ▏ ≥ 1 / 2 holds for all x ＞ 0. On the left, the function x + 1 / X is in X ＞ 0. Draw a function diagram (this is a common typical function in senior high school questions. Remember his diagram). You can know that x + 1 / X ≥ 2, and T = x + 1 / X ≥ 2 (x ＞ 0), then there is ▏ T-A ▏ ≥ 1 / 2, left and right squares, T & sup2; - 2at + A &
Physical electrical formula
I want Chinese characters
We need all of them.
Current = quantity of electricity / time (seconds) electric work = current * voltage * time (seconds) electric power = electric work / time (seconds) = current * voltage series circuit: total voltage = voltage at both ends of conductor a + voltage at both ends of conductor B + Total current = current through conductor a = current through conductor B = Total resistance = resistance of conductor a + resistance of conductor B + parallel connection...