How many centimeters can the water surface rise to when a cuboid tank with a length of 50 cm, a width of 40 cm and a height of 30 cm is filled with water 20 cm deep and a cube with a length of 20 cm is immersed in water?

How many centimeters can the water surface rise to when a cuboid tank with a length of 50 cm, a width of 40 cm and a height of 30 cm is filled with water 20 cm deep and a cube with a length of 20 cm is immersed in water?

10×10×10÷（50×40）
=1000÷2000
=0.5 (CM)
A: water rises by 0.5cm

First fill a square water tank with 4 decimeters in length, and then pour the water into another cuboid water tank with 0.8 meters in length and 25 cm in width
What is the depth of the tank? (the thickness of the tank is ignored)

0.8 m = 8 decimeters 25 cm = 2.5 decimeters
4×4×4÷（8×2.5）
=64÷20
=3.2 (decimeter)
A: the depth of the water tank is 3.2 decimeters

There is a cuboid with a length of 40 cm, a width of 30 cm, and a height of 25 cm. The water tank is filled with water 15 cm deep, and the six edges are small cubes 10 cm long
Submerge into the water. How many centimeters can the water level of the water tank rise?

1. Volume of water: 40 * 30 * 15 = 18000 cubic centimeter
2. Find the volume of six cubes: 6 * 10 * 10 * 10 = 6000 cubic centimeters
3. Divide the total volume by the bottom area of the tank: (18000 + 6000) / (40 * 30) = 20cm
A: the water rises to 20 cm

A = 6, C = 1, the standard elliptic equation with focus on x-axis is?

a=6 c=1,
a²=36,c²=1
So B & sup2; = 36-1 = 35
So the standard equation of ellipse with focus on X axis is X & sup2 / 36 + Y & sup2 / 35 = 1

Find the following general formula (1) - 3 × 7,4 × 8, - 5 × 9,6 × 10
（1） -3×7,4×8,-5×9,6×10
（2）3,5,9,17
（3）1,1/2,3,1/4
(4) 0,(2^2-2)/5,(3^3-3)/10,(4^4-4)/7

(1)an=(-1)^n(n+2)(n+6)=(-1)^n(n²+8n+12)
(2)an=2^n+1
(3)an=(1/n)^((-1)^n)
(4)an=(n^n-n)/(n²+1)

7 (x minus 2) equals 0.35

Divide both sides by 7
x-2=0.35÷7
x-2=0.05
x=2+0.05
x=2.05

-Nine out of two, 100 out of two is a fraction

It's 100 out of - 18
The reduction is - 50 / 9
Please click the "select as satisfactory answer" button below,

When the formula = vlookup (A3, $a $30): $AE $1029, column (), 0) is used in Excel, a value is not available for just one formula?
------A-------B-------C-------D------
1、283 015
2. The N / a problem is as follows: I use the formula = right (left (A1) + mid (a1,2,1)) * 100 + right (mid (a1,2,1) + mid (a1,3,1)) * 10 + right (left (A1) + mid (a1,3,1)) to calculate the sum of two numbers of 283 in A1, 0) when the number is automatically filled: # n / A is displayed as: a certain value is not available for this formula. This happens when the previous hundreds of bits are 0. If the previous hundreds are not 0, there will be no error. I don't know why. How to do? Thank you!
015 corresponding number: 2570893461 on line 45
After using the formula of square brackets, the number with 0 in front of it can be filled correctly, but other numbers have errors in front of it

Solution equation: 19-12% x = 7

:19-12%X=7
0.12x=19-7
0.12x=12
x=100

Draw any circle and increase its radius by a quarter. What's the current area?

Let the radius of the original circle be 1, now the radius is 1 x (1 + 1 / 4) = 5 / 4, the area of the original circle is π x1x1 = π, now the area of the circle is π X5 / 4x5 / 4 = 25 / 16 π, 25 / 16 π divided by π = 25 / 16, now the area is the original 25 / 16
Or click "satisfied" in the upper right corner of the client
It's my motivation to move forward! Your adoption will also bring you wealth value. We learn from each other!
If you don't understand,
Don't mention it until you fully understand the problem!