-2.5 divided by 5 / 8 multiplied by (- 1 / 4) - 27 divided by 2 and a quarter multiplied by 4 / 9 divided by (- 24) (- 3 / 5) multiplied by (- 3 and a half) divided by (- 1 and a quarter) -4 times 1 / 2 divided by (- 1 / 2) times 2 - 5 divided by - 1 and 2 / 7 multiplied by 4 / 5 multiplied by - 2 and 1 / 4 divided by 7 1 and 1 / 8 divided by 3 / 4 times 4 / 3 times 1 / 2

-2.5 divided by 5 / 8 multiplied by (- 1 / 4) - 27 divided by 2 and a quarter multiplied by 4 / 9 divided by (- 24) (- 3 / 5) multiplied by (- 3 and a half) divided by (- 1 and a quarter) -4 times 1 / 2 divided by (- 1 / 2) times 2 - 5 divided by - 1 and 2 / 7 multiplied by 4 / 5 multiplied by - 2 and 1 / 4 divided by 7 1 and 1 / 8 divided by 3 / 4 times 4 / 3 times 1 / 2

-2.5 divided by 5 / 8 times (- 1 / 4) = - 4 × (- 1 / 4) = 1-27 divided by 2 and a quarter times 4 / 9 ^ (- 24) = - 12 × 4 / 9 ^ (- 24) = - 16 / 3 ^ (- 24) = 2 / 9 (- 3 / 5) times (- 3 and a half) ^ (- 1 and a quarter) = 21 / 10 ^ (- 5 / 4) = - 42 / 25-4 times 1 / 2 ^ (- 1 / 2) times 2 = - 2 ^ (- 1 / 2)

Three and a quarter minus two and a half = three and a half minus two and a half = 6.8 + 13 and a half = five and a quarter minus two and a half=

Three and four minus two and two
=3-2 + 3 / 4-1 / 2
=1 + 1 / 4
=1 and 1 / 4
Three and a half minus two and a half
=3-2 + 1 / 2-1 / 2
=1
6.8 + 13 and 1 / 2
=6.8+13.5
=20.3
Five and a quarter minus two and two-thirds
=4-2 + 3 / 2-2 / 3
=2 + 5 / 6
=Two and five sixths

Find a rule, fill in half, three and half, seven, ten, twenty, (), ()

The second number is three times more than the first number, and the third number is twice the second number
This cycle
0.5,3.5,7,10,20,23,46,49..

A certain amount of oxygen is contained in a steel cylinder. If 14 of them are used in one welding, the mass of residual oxygen in the cylinder will be reduced______ , volume______ , density______ (fill in "larger", "smaller", "unchanged")

After releasing part of the gas from the cylinder, the mass of the gas becomes smaller, but the volume remains unchanged. According to the formula ρ = MV, the density becomes smaller

If we define a ⁃ B = 5 * A-2 * B, where a and B are natural numbers, we calculate 10 ⁃ 6,8 ⁃ 7

According to your title, 60280, you should have left out the letters
We can deduce (a + 2) B = 5a, B = 5A / (a + 2). I'll see the rest

For a project, Party A, Party B and Party C shall cooperate for 10 days. If Party C has five days off, Party B shall do two more days, or Party A and Party B shall cooperate for one more day?

Party B will do it for two more days, or Party A and Party B will cooperate for one more day
It means the speed is the same
C rest for 5 days, B will do 2 more days, indicating that the speed of B is 2.5 times that of C
10*（1+1+1/2.5）=24
A alone for 24 days

Can humans develop aircraft that can be separated from the solar system? According to the current speed of aircraft, if there is a suitable aircraft for human survival in a light-year away
Is the planet not waiting to fly to the place, people have died of old age

The first problem is no problem. To get out of the solar system, we only need to reach the speed of the third universe, which is 16.7km/s. Both voyagers have reached the speed of the second problem. First of all, there must be no habitable planet at the distance of one light year, and indeed at the speed of the current aircraft, people will die of old age and want to go on such a long interstellar voyage We have to live and multiply on the spaceship and live in the voyage for a long time

A circle is a closed figure enclosed by (). The ratio of () to () of a circle is called PI

A circle is a closed figure enclosed by a curve. The ratio of circumference to diameter of a circle is called PI

If we make an inscribed cylinder in a sphere with a spherical area of 52 π, and the ratio of its bottom radius to its height is 1:3, then the volume V of the cylinder will be the same=
The answer is 24 π
thank

Make an equation
Let the radius of the cylinder be x, then we get the radius of the sphere: 4 π R ^ 2 = 52 π, ∧ R ^ 2 = 13
Using the cylinder to find the radius of the sphere r = ((2x) ^ 2 + (3x) ^ 2) ^ 0.5/2, the solution is x = 2
So v-cylinder = π x ^ 2 × H = 2 ^ 2 π × 6 = 24 π

F (x) = power of 3x + power of 3x-1
Find (1) to prove that f (x) is an odd function (2) to judge the monotonicity of F (x) and prove it

F (x) = (3 ^ x-1) / (3 ^ x + 1) f (- x) = (3 ^ (- x) - 1) / (3 ^ (- x) + 1) = (1-3 ^ x) / (1 + 3 ^ x) = - (3 ^ x-1) / (3 ^ x + 1) = - f (x), so it is an odd function. Let x2 > x1f (x2) - f (x1) = (3 ^ x2-1) / (3 ^ x2 + 1) / (3 ^ X1 + 1) = [(3 ^ x2-1) (3 ^ X1 + 1) - (3 ^ x1-1) (3 ^ x2 + 1)] / (3 ^ x2 + 1) (...)