How many square decimeters of glass does it need to make a goldfish tank (without cover) 12 decimeters long, 5 decimeters wide and 8 decimeters high The price of glass is 0.8 yuan. How much does it cost to make this goldfish?

Hello:
Required glass = 12 × 5 + (12 × 8 + 8 × 5) × 2 = 332 (square decimeter)
Amount of money needed = 332 × 0.8 = 265.6 yuan

There is a cuboid shaped glass jar, which is 3 decimeters long, 2 decimeters wide and 2 decimeters high. There is water in it, and the water depth is 1 decimeter. Put a glass ball in the glass jar, and the water rises to 1.3 decimeters. How many cubic decimeters is the volume of the glass ball?

3 × 2 × (1.3-1), = 6 × 0.3, = 1.8 (cubic decimeter); a: the volume of glass ball is 1.8 cubic decimeter

The first question is: 3, - 6,4,10
The second question is: 3, - 5, - 11,7
We can only use addition, subtraction, multiplication and division, not power

The first: 3 * (- 6 + 4 + 10)
Second: (7-3) * (- 5 - (- 11))

What are the rules of the translation of a function and the size of K in a function?

1、 When y = KX + B is translated, K changes, a is translated to the left, y = KX + B + A is translated to the right, a is translated to the right, y = KX + B-A is translated upward, a, + Ka is translated upward, a, - Ka is translated upward; 2. K = Tan (the angle between the line and the X axis), the included angle is not 0 or 90 degrees,

Cuboid wood block, the surface area is 18 square decimeters, its bottom circumference is 12 decimeters, and its height is 0.6 decimeters?

Cuboid wood block, the surface area is 18 square decimeters, its ground perimeter is 12 decimeters, 0.6 decimeters high. What is the volume of this wood block?
Let the length of the bottom be a decimeter, then the width be B decimeter
Then 2 * a * B + 12 * 0.6 = 18
So AB = 5.4
Because volume = length * width * height
So the cuboid volume is 5.4 * 0.6 = 3.24 cubic decimeters

6.2.3 is 24 points

6 * 6 divided by 3 * 2 = 24

Parametric equation problem! Find the minimum value of M = (2-sin θ) / (1-cos θ)
It seems that the teacher reminds us to express sin θ and cos θ with X and Y. then it should be x = RCOs θ and y = rsin θ. It can be substituted into M = (2r-y) \ (R-X)... Next step, I still can't do it

The points (x, y) in the unit circle in the coordinate system can be represented by (COS θ, sin θ)
Then M can be regarded as the minimum of the slope from (1,2) to (COS θ, sin θ)
The minimum value of M is 3 / 4

A hollow cylinder has an outer diameter of 600mm, an inner diameter of 450mm and a height of 370mm

Let the outer diameter be D, the inner diameter be D, the height be h, and the density be ρ,
Then v = π H (d ^ 2-D ^ 2) / 4,
Mass m = π h ρ (d ^ 2-D ^ 2) / 4,
Weight g = π h ρ g (d ^ 2-D ^ 2) / 4,
Outer diameter d = 0.6m, inner diameter d = 0.45M, height h = 0.37M,
Then the volume v = π * 0.37 * (0.6 ^ 2-0.45 ^ 2) / 4 ≈ 0.045769m ^ 3
I don't know what the material is. Of course, I don't know the density. The acceleration of gravity g = 9.8m/s ^ 2

The circumference of a rectangle is 36cm. If the length is reduced by 4cm and the width is increased by 2cm, the rectangle becomes a square. If the length of the original rectangle is xcm, the equation is______ ．

∵ the circumference of the rectangle is 36cm, the length of the rectangle is xcm, the width is (18-x) cm, and the equation is: x-4 = 18-x + 2

In the plane rectangular coordinate system, the intersection of the parabola y = 3x & # 178; + 5x-2 and the x-axis has the following characteristics
A. 2
B. 1
C. 0
D. Not sure

Discriminant △ = B & # 178; - 4ac
=25+24>0
So the equation y = 3x & # 178; + 5x-2 = 0 has two different roots
So there are two intersections with the x-axis
Choose a

How many square decimeters of glass does it need to make a goldfish tank (without cover) 12 decimeters long, 5 decimeters wide and 8 decimeters high The price of glass is 0.8 yuan. How much does it cost to make this goldfish?