//////////// 2、 Can you help the lost dog find its way home? (a dog) 0.24x100.07x100 6.47x100 157 except 100 8.04x100 (dog's home) I don't understand the meaning of this question?

//////////// 2、 Can you help the lost dog find its way home? (a dog) 0.24x100.07x100 6.47x100 157 except 100 8.04x100 (dog's home) I don't understand the meaning of this question?

The title means, which way is closer, which way. So 157 divided by 100

Let the two focal points of the ellipse x ^ 2 / A ^ 2 + y ^ 2 / b ^ 2 = 1 (a > b > 0) be F1 and F2. If there is a point P on the ellipse, let Pf1 ⊥ PF2, find the range of eccentricity e of the ellipse

When p is at (0, b), f1pf2 is the largest,
Suppose that there is Pf1 ⊥ PF2 when p is at (0, b), then 2C = √ 2A
At this time, the eccentricity of ellipse e = √ 2 / 2
The more elliptical the ellipse is, the larger ∠ f1pf2 is. There must be a point P on the ellipse, making Pf1 ⊥ PF2
The value of eccentricity e tends to be 1
So the value range of E is [√ 2 / 2,1)

An electrical appliance that converts electrical energy into chemical energy

All kinds of rechargeable batteries should be

Alcohol is composed of alcohol particles. With alcohol and water as raw materials, we provide alcohol lamp, evaporating dish, iron frame with iron ring, beaker, glass rod, measuring cylinder and rubber head dropper. Please design an experiment to prove that alcohol particles are constantly moving, and there are gaps between alcohol particles

Use a measuring cylinder to measure the volume of VL alcohol and water respectively. After mixing them, the volume is less than 2vl, which is enough to prove that there is a gap between the alcohol particles. I can't do anything to prove that the particles move continuously, but I can remind you that it is necessary to prove that Brownian motion or liquid diffusion is not necessary for the particles to move, but there is no dye here

What is the maximum allowable voltage when two resistors of 100 ohm 40 W and 100 ohm 25 W are connected in series?

According to the formula "P = I ^ 2 * r", the maximum current allowed to pass through a "100 ohm 40 W" resistor is I1 (P1 / R1) = root (40 / 100) = 0.2 * root 10 a = 0.632 A. similarly, the maximum current allowed to pass through a "100 ohm 25 W" resistor is I2 (P1 / R1) = root (40 / 100) = 0.2 * root 10 a = 0.632 a

Given that a sequence an is an equal ratio sequence, A2 = 5, A5 = 0.25, then a & # 8321; a & # 8322; + A & # 8322; a & # 8323; +... + an × a (n + 1)

a2=5,a5=0.25a5=a2*q^3q^3=a5/a2=0.25/5=0.05q=0.05^(1/3)a₁a₂+a₂a₃+...+an ×a（n+1）=a₁^2q+a₂^2q+a₃^2q...+an^ q=q[a₁^2+a₂^2+a₃^2...+an^ ]=q[a&#...

The bottom area of a cylindrical measuring cylinder is 5cm. After a piece of iron is taken out of the measuring cylinder, the water surface is reduced by 3cm. What is the volume of this piece of iron?

The water surface is reduced by 3cm, so the volume of 5 * 3 = 15cm & sup3; is reduced
So the volume of iron block is 15cm & sup3;

Define the operation ⁃ a ⁃ B = a + B ⁃ x + (a + b) (B + 1) ⁃ y. given 1 ⁃ 2 = 3, 2 ⁃ 3 = 4, find the value of 3 ⁃ 4
Please

Substituting a = 1, B = 2 and a = 2, B = 3 into a ⁃ B = a + B ⁃ x + (a + b) (B + 1) ⁃ y, we get
3/X+9/Y=3
5/X+9/Y=4
X=-5/21
Y=105
3※4=5

Three new dry batteries are connected in series to form a power supply, and an 8 ohm resistor is connected externally. To measure the voltage at both ends of the resistor, the range of the voltmeter should be the range of the ammeter

0-15V
The measurement range should be greater than 3vx1.5 = 4.5V
It's the range of 0-15v

Chemical equation of benzene combustion in air
I also want to give you points, but not much

2c6h6 + 15O2 = 1 [ignition] 2co2 + 6H2O