Hurry up! Sixth grade cylinder surface area to improve the application problem! Fast! Urgent!

Hurry up! Sixth grade cylinder surface area to improve the application problem! Fast! Urgent!

1. If there is a cylinder with a bottom diameter and height of 10cm, how much will its surface area increase if it is cut down into two pieces along the diameter? 2. Cut a cube into a cylinder with the largest volume. If the side area of the cylinder is 314cm, calculate the surface area of the cube

If the perimeter of the rectangle is 36cm and the area is 54 square cm, what are the length and width of the rectangle?
Such as the title

The length and width are x, y, respectively
x+y=36 / 2
xy=54
That is x ^ 2-18x + 54 = 0
The solution is x = 9 + 3 * radical 3 or 9-3 * radical 3
I'll ask for it

How many significant numbers are there when 1.11 times 10 to the sixth power

3
For numbers expressed by scientific counting method, the significant number only depends on the significant number of the number in front of the multiplier sign

It took 24 seconds for a train to pass through the first 360 meter long tunnel, and then 16 seconds to pass through the 216 meter long tunnel?

It takes 8 seconds for a train to pass through the first tunnel more than the second tunnel. Why does it take 8 seconds more? The reason is that the first tunnel is 360-216 = 144 (meters) longer than the second tunnel, which corresponds to 8 seconds. In this way, the speed can be calculated

Triangle ABC is divided into two parts by De, be = 1 / 3AB, BD = 1 / 4bc, then how many parts of triangle ABC is the area of triangle BDE

One in 12
BE=1/3AB,BD=1/4BC
The area of triangle ABC is 1 / 2xab XBC
The area of triangle BDE is 1 / 2xbexbd

The speed of light in vacuum is 300000 kilometers per second. Light year is a unit to measure the distance of celestial bodies. It refers to the distance that light travels in a year. A light year is about 300 thousand kilometers per second

Using the speed of light 299792458 times the time of a year is not the distance of light in a year. This is called light year, which is equal to 94607304725800m. Generally, it takes 9.46x10 ^ 15m

If the fixed line telephone charges 24 yuan for the landline first, and then the call fee is added according to a certain standard and time, then the monthly call fee and call time ()
A. In proportion B. in inverse proportion C. out of proportion

Monthly telephone fee = landline fee + call fee, because the landline fee is quantitative, and the call fee is related to a certain standard (Quantitative) and time, indicating that the longer the call time is (or the shorter), the more (or the less) the call fee will be, and the more (or the less) the call fee will be. The change direction of the two quantities is the same, so the monthly telephone fee and call time should be paid A

Fold the 8 cm square piece of paper ABCD so that point d falls at the midpoint e of BC side and point a falls at point F. the crease is Mn. Calculate the length of line CN
Don't use similarity. Tonight,

A square piece of paper with a length of eight cm (8 cm) is a piece of paper ABCD. Point d falls at the midpoint e of BC, and point a falls at point F, and the crease is Mn. The length of line cn ┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄\\\\\\\\\\\\\∠ DPN =

The density of the object in the physical density meter is read as? Example: water XX grams or kilogram one cubic centimeter or meter

The basic unit of density is kilogram per cubic meter. When you read /, you will get kilogram per cubic meter. Density is expressed by the Greek letter rou

A and B start from two places at the same time and travel in opposite directions. The distance is 900 kilometers. The speed ratio of a and B is 2:3. After six hours, they meet. What are the speeds of a and B?

Let the speed be 2x and 3x
6(2X+3X)=900