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A cube sheet of iron, with an edge length of 50 cm, cuts a 10 cm square from each of the four corners, and then makes a box without a cover. How many sheets of iron does this box use? What is its volume?
1、50—10—10=30
30 × 30 + 30 × 10 × 2 + 30 × 10 × 2 = 2100 square centimeter
2. 30 × 30 × 10 = 9000 CC
An area of 108 square centimeters of square sheet iron, made of a square box without cover, the largest surface area is how much
It's better to have a picture
Divide the 108 square centimeter into 9 parts, then 108 / 9 = 12 (cm2) 12 * 5 = 60 (cm2)
A cube with an edge length of 6 decimeters has the same surface area and volume ()
A cube with an edge of 6 decimeters long has the same surface area and volume (×)
The unit of surface area is the square decimeter
The unit of volume is cubic decimeter
The values of surface area and volume are the same, but the units are different
The edge length of a cube is 6 decimeters, and its surface area and volume are equal
No, volume and surface area are different concepts
It is known that the line y = KX + B is parallel to the line y = - 3x + 4, and the intersection point with the line y = 2x-6 is on the Y axis
Find the analytic expression of this linear function
The line y = KX + B is parallel to the line y = - 3x + 4
Then: k = - 3
The intersection of the line y = - 3x + B and the line y = 2x-6 is on the Y axis
It is easy to get that the intersection of y = 2x-6 and Y axis is (0, - 6)
Then (0, - 6) is substituted by the straight line y = - 3x + B to obtain:
b=-6
Therefore, the analytic expression of this linear function is: y = - 3x-6
If the line y = KX + B is parallel to the line y = - 2x and intersects with another line y = x + 3 at a point on the Y axis, then the expression of the line is
Parallel means that the analytic expressions K of two functions are equal and B is not equal
So the analytic expression of the function is y = - 2x + B
Y = x + 3Y axis intersection is (0,3)
Substituting
b=3
So the analytic expression of this function is y = - 2x + 3
It is known that the first-order function y = KX + B intersects the x-axis at the point (1,0), and intersects the straight line t = 2x-3 and y at the same point
The intersection point of the straight line t = 2x-3 and the Y axis can make x = 0 to be (0, - 3); the obtained functions pass through the points (1,0) and (0, - 3) once and are substituted into the function to obtain the system of linear equations of two variables {K + B = 0, B = - 3}. The solution can obtain k = 3, B = - 3, and the analytical formula of the straight line is y = 3x-3
The intersection point of the line y = KX + B parallel to the line y = 1 / 3x and with the line y = 2x-2 is on the x-axis, k = ----, B=-----
It's better to use "because, so" to answer
If the line y = KX + B is parallel to the line y = 1 / 3x, then k = 1 / 3
The coordinate of the x-axis at the intersection of the line y = 2x-2 is (1,0)
Substituting point (1,0) into y = 1 / 3x + B
The solution is b = - 1 / 3
Hope to adopt!
If the line y = KX + B is parallel to the line y = − 13X and the intersection point with the line y = 2x-6 is on the X axis, then K=______ ，b=______ ．
∵ the line y = KX + B is parallel to the line y = - 13X, ∵ k = - 13, let y = 0, then 2x-6 = 0, the solution is x = 3, ∵ the intersection coordinates of the line y = 2x-6 and the X axis are (3, 0), ∵ the intersection coordinates of the line y = KX + B and the line y = 2x-6 are on the X axis, ∵ - 13 × 3 + B = 0, the solution is b = 1
Given that the line y = KX + B is parallel to the line y = 3x, and the intersection point with y = 2x-6 is on the x-axis, the value of K + B is obtained
If parallel, the coefficient of X is equal
So k = 3
X-axis then y = 0
That is, when y = 0, two X are equal
y=3x+b=0,x=-b/3
y=2x-6=0,x=3
So - B / 3 = 3
b=-9
So K + B = - 6
RELATED INFORMATIONS
- 1. The surface area of a cube whose edge length is 4 decimeters is (), the volume is (), and the total edge length is ()
- 2. A cube box is 2 decimeters long. How many square decimeters is the surface area of the box? How many square decimeters is the area of the trademark pasted around?
- 3. A cube box, the edge length is 16. How many square decimeters does the box cover?
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- 6. A rectangular iron plate, 30 cm in length and 25 cm in width. As shown in the figure, cut the square with a side length of 5 cm from four corners, and then make a box. How many ml is the volume of this box?
- 7. It is known that the area of rectangle A and square B is equal, if the length of rectangle A is 4.5x10 to the third millimeter and the width is 32x10 to the second millimeter How many square millimeters is the area of square B
- 8. A cuboid becomes a cube when its height increases by 4 cm, and its surface area increases by 80 square cm. What is the cuboid's volume in cubic cm? There should be formulas
- 9. A cuboid wood block is cut off from both ends and its surface area is reduced by 80 square centimeters. How many cubic centimeters is the volume of the original cuboid? A cuboid block of wood, cut off from both ends of the cuboid for 2 cm, will become a cube, the surface area reduced by 80 square centimeters?
- 10. There is a rectangle, its length, width and height are three continuous natural numbers, and its volume is 210 cubic meters?
- 11. The square iron sheet with an area of 108 square centimeters is made into a square box without cover. The surface area of the box should be as large as possible. What is the size of the box
- 12. The cube is 1 decimeter long and? Cubic meter in volume
- 13. A cube box can just put a cylinder with a volume of 628 cubic centimeters. How many cubic centimeters is the volume of this box?
- 14. A cube paper box can just put a cylinder with a volume of 6280 cubic centimeters. How many cubic centimeters is the volume of this paper box
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- 19. Calculate the following problem, can be simplified to 2.4 × 1.25 19-5 / 6-6 / 7-1 / 6
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