1. In the process of melting, the state of amorphous is changed from solid to solid, then to liquid, and in the process of melting, although the solid and liquid coexist, the solid and liquid coexist Lead is (crystalline, amorphous) 3. The reason why the temperature of crystal remains unchanged in the melting process is 4. The mass of ice must increase () A. Ice at - 10 degrees Celsius is put into water at 1 degree Celsius B. Ice at - 10 degrees Celsius is put into air at 1 degree Celsius C. Ice at - 2 degrees Celsius into water at 1 degree Celsius D. The ice at 0 ℃ is put into the air at 0 ℃

1. In the process of melting, the state of amorphous is changed from solid to solid, then to liquid, and in the process of melting, although the solid and liquid coexist, the solid and liquid coexist Lead is (crystalline, amorphous) 3. The reason why the temperature of crystal remains unchanged in the melting process is 4. The mass of ice must increase () A. Ice at - 10 degrees Celsius is put into water at 1 degree Celsius B. Ice at - 10 degrees Celsius is put into air at 1 degree Celsius C. Ice at - 2 degrees Celsius into water at 1 degree Celsius D. The ice at 0 ℃ is put into the air at 0 ℃

1. In the melting process of amorphous, the state changes from solid to liquid, then to liquid, and finally to vapor-liquid. In the melting process of crystal, although the solid and liquid coexist, the quantity of solid and liquid changes constantly
Lead is (crystal)
3. The reason why the crystal temperature remains unchanged in the melting process is that (in the heating process, the kinetic energy increases due to the molecular heat absorption, and when the energy reaches a certain extent, it will no longer be bound by the lattice and break away from the lattice. At this time, the lattice is destroyed. The lattice destruction process is a strong endothermic process, and most of the heat absorbed by the molecules is used for the lattice destruction, So when the crystal melts, the temperature of the crystal basically remains unchanged. When all the lattices are destroyed, the temperature rises intermittently
4. The mass of ice must increase (a)
A. Ice at - 10 degrees Celsius is put into water at 1 degree Celsius
B. Ice at - 10 degrees Celsius is put into air at 1 degree Celsius
C. Ice at - 2 degrees Celsius into water at 1 degree Celsius
D. The ice at 0 ℃ is put into the air at 0 ℃

It's a knowledge point, not a review outline,

The first chapter is the rich world of figures. 1. Geometric figures are all kinds of figures abstracted from objects, including three-dimensional figures and plane figures. Three dimensional figures: some parts of geometric figures are not in the same plane, they are three-dimensional figures

Find the rule: 16 48 24 72 36 108 () () 81

54 and 162
Very simply, 48 is three times 16, 24 is half 48, and so on

What's the result of multiplying all prime numbers within 10, adding the largest two digits and subtracting the smallest three digits?

2*3*5*7-1=209

Given that the image of the function f (x) defined on R is symmetric with respect to the point (- 3 / 4,0), and f (x) = - f (x + 3 / 2), f (- 1) = 1, f (0) = - 2, then f (1) + F (2) + F (3) + +What is the value of F (20009)

Because f (x) = - f (x + 3 / 2) f (x + 3 / 2) = - f (x + 3 / 2 + 3 / 2) = - f (x + 3), so f (x) = - f (x + 3 / 2) = f (x + 3), so 3 is a period of F (x), because f (- 1) = 1, f (0) = - 2, then f (2) = 1, f (3) = - 2, so only f (1) is required, because (- 1, f (- 1)) point is (- 1 / 2) about (- 3 / 4,0)

How to calculate 3.87 divided by 4.3 times (1.2 + 0.3)?

3.87 divided by 4.3 times (1.2 + 0.3)
=[(4.3-0.43)/4.3]x1.5
=(1-0.1)x1.5
=1.5-0.15
=1.35

Factorization factor: the square of (x + y) * 2 (x + y) + 1-4z
Decomposition factor: square of (x + y) * 2 (x + y) + square of 1-4z

It should be (x + y) &# 178; + 2 (x + y) + 1-4z & # 178;
=(x+y+1)²-4z²
=(x+y+1+2z)(x+y+1-2z)

Help me to solve an applied problem of quadratic equation of one variable,
The quadratic equation of one variable x ^ 2 + 4x + M-1 = 0 is known. Please choose a suitable integer for m so that the resulting equation has two unequal real roots

If the equation has two unequal real roots, the discriminant is greater than 0
That is: 4 ^ 2-4 (m-1) > 0
16-4m+4>0
m

A swimming pool can hold 1000 tons of water. If every cubic meter of water weighs 1 ton, the formula for calculating the volume of the swimming pool is ()
①1000×1
② 1000 tons = 1000 cubic meters
③1000÷1
Which one? Help me

1000 tons △ 1 m3 / ton = 1000 m3

Simple calculation: 4 / 5 minus (4 / 5 minus 5 / 12), 2 / 25 times 126, (0.875 minus 5 / 16) times (10 / 9 plus 2 / 3)

4 out of 5 minus (4 out of 5 minus 5 out of 12) = 4 out of 5-5 out of 4 + 5 out of 12 = 2 out of 12 multiplied by 126 = 2 out of 25 × (125 + 1) = 2 out of 25 × 125 + 2 out of 25 × 1 = 10 + 2 out of 25 = 10 and 2 out of 25 (0.875 minus 5 out of 16) multiplied by (10 out of 9 plus 2 out of 3) = (14 out of 16 5) ×