Finding Primary School Mathematics Concepts!! Hurry!! What questions are needed to add it!

Look it up on the Internet, or gather some information.

It turned out that there were female students in the gymnasium.

x-10=2(2x-20-45)

x-10=4x-130

x-4x=-130+10

3x=-120

x=40=Girls.

Boys = 2 (40-10) = 60

It turned out that there were 100 students in the gymnasium.

There are x girls and y boys.

Equation 1: y=2 (x-10).

Eq. 2:2 (y-45) = x-10

Equation 2 times 2 minus Equation 1:

3y-180=0

y=60x=40

x+y=100

A: Originally, there were 100 students in the gymnasium.

A: Originally, there were 100 students in the gymnasium.

Analysis: (I feel like my algorithm is a bit troublesome, roar).

Suppose the total number of girls is x and the total number of boys is y

First: y=2(x-10).

Second: x-10 = 2 (y-45).

y=2x-20

x-10=2y-90

80=2y-x

2(2x-20)-x=80

4x-40-x=80

3x=120

x=40y=2*40-20=60

Total number of students = x + y = 40 + 60 = 100 students.

Oops, it's been a long time since I've done a math problem, can you see it?

Set the original boy x person, girl y person, ask for x+y

x=2(y-10)

y-10=2(x-45)

The solution is x=60 y=40, i.e. there are 100 people.

If you don't understand, you can ask

Solution: Suppose there were x boys and y girls.

2（10+y）=x

10+y=2（x-45）

The solution is x=60y=20

It turned out to be 80 people.

In this problem, you can set the equation x=2(y -10), 2(x -45)=y -10

Solution: x=60 y=40 There are a total of 60+40=100 (people) in the gymnasium

Set up male x people and female y people.

x=2(y-10) ①

y-10=2(x-45) ②

Bringing y-10 in to gives x=60

Then bring x=60 into to get y=40

So it turned out that there were 60 + 40 = 100 people.

28 girls and 36 ...... boysThat ......Given the unknown, have you learned?

These 6 equations are all correct, but the meaning of the equations is different.

Pick d is the same equation, but it's deformed.

c because the last 5-x should be in parentheses.

It's all right, and the sixth minus sign is a multiplier sign.

Let y=e x -(1+x).

Derivative y'=e^x -1

x＞0∴e^x >1

e^x -1＞0

So y increases as x increases.

When x = 0, y = 0, x 0, y 0, i.e. e x > 1+x. Certification.

720/[(16+?3], I missed the brackets when I did this question, so the result is equal to 54,? =How much is the correct calculation equal to?

Solution: ?=720/54/3-16=24

The correct calculation is equal to:

6 Today, someone holds the rice out of the three passes, the outer pass five and takes one, the middle pass six and takes one, the inner pass seven and takes one, the remaining meter eight buckets, and asks the meter geometry?

Solution: Holding rice is:

14 buckets. When a fortune fan crossed the bridge, he met an old man, and the old man said, "If you cross this bridge and walk back, your money will be doubled, but in return, you will give me 32 yuan for each round trip." The fan agreed, he went back and forth five times, and the last 32 yuan on his body was given to the old man, and there was no one left, how many yuan did the fan have?

Solution: If there is a wealth fan who has x yuan on his body, then:

2^4*x-32=0

16x=32

x=2 yuan. That is, the money fan originally had 2 yuan on him.

(16+x)*3=54,x=720/54*3-16x=24.

I've already answered this question, wasn't it you last time?

Root number n answer = root 10

3.Original = (1+2+3......+10）/4=10（10+1）/8=55/4

By all means.

Solution: If there are x kg of flour to be transported, then there are 2x + 20 kg of rice. x+500=2x+20

x=500-20

x = 480 480 2 + 20 = 980 kg A: 480 kg of flour and 980 kg of rice.

Hope that helps!!

The canteen brought in 20 kg more than twice as much rice as flour, and the mass of flour was 500 kg less than that of rice, and x kg of flour was set;

So 2 times the flour + 20 kg - flour = 500 kg;

That is, 2x+20-x=500

x=480;

So flour 480 kg; Rice = 480 + 500 = 980 kg Hello, I'm happy to answer for you, skyhunter002 for you to answer your questions, if you don't understand this question, you can ask, if you are satisfied, remember to adopt if there are other questions after this question click to ask me for help, it is not easy to answer the question, please understand, thank you.

Good luck with your studies.

set flour x kg;

So 2 times the flour + 20 kg - flour = 500 kg;

That is, 2x+20-x=500

x=480;

So flour 480 kg; Rice = 480 + 500 = 980 kg is very simple.

If the flour is x kg, then the rice is 2x+20

And rice is 500 more than flour

2x+20=x+500

x = 480, i.e. 480 kg of flour.

Rice is 2x+20=980 kg.