Winter vacation homework, hurry!! Brothers and sisters, help

Hello, qian113014

Calculate with ease.

2. The father is 30 years older than the son this year, is the father's age 3 times the son's age after 12 years, and how old are the sons this year? Column equation solution

Solution: If the son is x years old this year, then the father (x+30) is old this year, according to the title.

3(12+x)=x+30+12

36+3x=x+42

2x=6x=3

So x+30=3+30=33

A: This year, my father is 33 years old and my son is 3 years old.

3. Calculation. If you can make a simple calculation, you should make a simple calculation

4. Solve equations.

2x=2x=14x=7

x=20/x=30-7x=9

7x=30-9

7x=21x=21/7

x=33x+

x=x=7

In the third question, first turn the decimal into an integer.

Extract the common factor as.

Problem 4: Solve the equation.

For example: 2x= x= Calculate how much x is, and learn from me to solve the problem like this.

Question 2. Understand that fathers are always 30 years older than sons Establish equations.

Solution: The son is x years old this year, and the father is x + 30 years old this year.

After 12 years, the father is 3 times the age of the son.

then x+30+12=3 (x+12).

x = calculated x value is the son's age this year, plus 30 is the father's age this year.

Typing is tiring. I hope you can accept it. Hehe.

Just find a copy of it, it's easy.

50。After swapping the position, from two digits to one digit, you can know that the single digit is 0, let the ten digit be 10x, and after the transposition, it will be x, 10x-x=45, you can get x=5, so the original number is 50

After the number in a two-digit digit and the number in the ten digit are exchanged, it becomes a single digit, indicating that the number in the previous single digit must be 0, that is, the previous number is tens; The converted number is 45 smaller than the original number, which means that the original number is 50

50, the single digit and the ten digit are swapped to 05, which is 5, which is 45 smaller than the previous 50Hehe, it's time to relax after finishing your winter vacation homework, and I wish you a happy holiday.

The poles where ab and cd intersect are a and b, and when point a intersects, p is the difference between the two sector radii at the distance of p from the origin of the number axis o, i.e., 5-3=2 and a = -2

At point b, PBO is a right triangle with BO = 3 bp = 5;From Bys's theorem, we know that p is 4 from the origin of the number axis o (5 squared minus 3 squared, open root), that is, 4 (root number 16), a = -4

A can range from -2 to -4 (-4 <= a <= -2).

The qualifier for this question is that two arcs intersect. AOB is actually already determined, and CPD changes position as the P coordinate changes (changes in A). Moving the CDP left and right takes into account the critical condition: A and B are on the arc CD, respectively.

When A is on the arc cd, that is, AD coincides, then A 3 5 2, then the two arcs are actually tangent to each other, and the point should be rounded.

When b is on the arc cd, op = (5 3 ) = 4, then a = -4 so the value range of a is -4 a -2

Aunt Wang: Ning Ning, how did you get this?

Me: Aunt Wang, don't worry, what's going on?

Aunt Wang: My Xiaorong only scored 65 points in the Chinese test this time, and 13 points were deducted from the composition at once, which is really stupid.

Me: It's normal to not perform well in the exam for a while, and you can't deny it all at once.

Aunt Wang: What you say makes sense, but I can't get good grades in the exam, it seems that there is something wrong with the child's brain.

Me: Definitely not. It may be that Xiaorong usually has not formed a certain concept of how to write a good composition. With a lot of practice, it will definitely have an effect.

Aunt Wang: Really? So how should Xiaorong relate to the composition in the future?

Me: Reading more extracurricular books can improve your knowledge, which will be beneficial to you before writing.

Aunt Wang: I see, I have to thank you for making it clear, Ning Ning!

Me: Aunt Wang is welcome, I hope Xiaorong will get better and better at studying.

I'm glad to answer your questions and wish you progress in your studies! The [the1900] team will answer the questions for you.

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Cornered, the road is connected, reasonable, reasonable, poor, poor, poor, and hot.

The volume ratio of a cylinder to a cone of equal height is 3 to 1

Therefore, since the bottom is equal and the volume is equal, the height of the cone must be 3 times that of the cylinder.

Do you go around in one circle or many times until you wrap around the bucket?

1.The height of the cone is 12 cm. The radius of the base surface of the cylinder and the cone is equal, and the area of the base surface of the cylinder and the cone is equal.

Let the base area of the cylinder and the cone be s square centimeters, and the height of the cone is x centimeters.

The volume of the cylinder and the cone is equal, i.e., 4s=sx 3, and the solution is x=12(S on both sides are removed at the same time).

2.(5 + dm.)

--Actually, I don't really understand the second question, what's the use of high? Is it ignoring the thickness of the barrel?