A math problem in the first year of junior high school, about rational numbers

You're doing it wrong! Since subtracting a number is equal to adding the opposite of this number, and considering this number as x, then the solution is: x=

Because -( so.

Also because -( so.

You're all wrong.

If the answer you want is, it should be.

If your topic is:

That's obvious,,x=

The answer is that you and your classmates and teachers are all wrong.

It's all wrong, if you encounter this kind of problem, tell you how to do it.

1. Addition exchange method.

2. The negative sign refers to the law.

As just now - (?=

Rule? =3, take the negative and the negative to get the positive.

Your answer is wrong. Yours.

Yes, that is, negative and negative are positive).

So it's you who are wrong.

i.e. negative negative positive).

So you're wrong.

Is it upside down?

And negative negative is positive, that is.

Blame!!!

This one is relatively simple.

yes. That's it, how did you teachers do it.

And also. You're wrong, too.

x=x=

How did they figure it out? Uncanny!!!

There are many test questions on the official website of Giant School, you can go up and find what you need.

Let the cup mouth face up as "+" and mouth down as "-".

The orientation of the mouth of n cups, which can be seen as the product of n numbers, is symbolized as "+" or "-".

When n is an odd number, the symbol of the product of all cups facing down can be seen as "-" because, changing the orientation of both cups at the same time, the symbol of the product does not change.

Therefore, no matter how you change the orientation of the mouths of the two cups, it is impossible to change the symbol of the product from "+" to "-".

Therefore, it is impossible to have 3 or 7.

This is only possible if there are even cups.

The answer is no, I don't know what the landlord said.

The law of multiplication of rational numbers.

What is it?,I'll just say it according to my understanding.。。 Set the cup up state to 1 and the down-facing state to 0, the initial state is 7 1s, and the final state to be reached is 7 zeros. The question requires 4 state changes at a time, and we will divide the state changes every 4 times into several categories.

In the first case, 4 times are applied to different cups, so that the result is that all 4 cups are changed once; The second case is that 4 times only act on 3 cups, that is to say, one cup is acted on twice, and the result is that the state of the cup that is acted on twice does not change, and the other two change, so the result is that 2 cups change state; In the third case, 4 times on 2 cups, the result may be that both states change (one changes 1 time, one changes 3 times) or both states do not change (each one changes 2 times); The last case, which is also the simplest, is to act on the same cup 4 times, and the result, of course, does not change the state. Summarizing the above 4 situations, it can be found that the number of cups that change the state may be 4, 2, and 0 for every 4 changes according to the requirements of the question. The result of several transformations is also these three numbers.

Linear combinations. The number 7 is an odd number and cannot be obtained by a linear combination of 4, 2, and 0. Therefore, the requirements in this question cannot be met. I don't know how to explain it, the landlord understands. To be honest, I'm a little dizzy, hehe.

(-2) squared = 4

5 squared = 25

A: Yes 26

The first display (-2) 2+1=5

The second show is 5 2+1=26

=16-8+13-9+12-6+10

28 km. Answer; b is 28 kilometres east of a.

16 + 8 + 13 + 9 + 12 + 6 + 10) == liters.

Answer; liters of fuel consumption.

1) Each number is equal to the sum of the following two numbers: -19=-11+(-8) 11=-5+(-6) 8=-6+(-2).

2) then -4+12=8 12+(-14)=-2 -2+8=6

One (1), east side; 28 kilometers, add those numbers together.

2) Add the absolute value and multiply it to get it.

Two (1) Each number is equal to the sum of the following two numbers. (2) From top to bottom, from left to right, is , -2.

One: (1) B is on the east side of A. The distance is 28 km. (2) liters.

2: (1) The sum of two digits from bottom to top.

1. If the altitude of place C is calculated as 0m, the altitude of place A is 45 meters, and the altitude of place B is 50 meters.

2. The denominator is 2n-1, n is an odd number is a positive number, and n is an even number is a negative number, so the 199th number is 1 (199*2-1) = 1 3973, every two numbers are a group, where the first number of each group is a natural number starting from 2, and the latter number is -1

199/2=99……1, so the 199th number is the 1st number of the 100th group, so it is 100+1=101

For a cycle, there are 6 negative numbers in a cycle 2008 9=223......1, so 2008 figures have a total of 223*6+1=1339 negative numbers.

1, (i.e. add 10 to each place).

45m in A and 50m in B

2. As can be seen from the question, the denominator is 1, 3, 5, 7 ......, 2n-1 The denominator of the 199th number is 2 199-1=397 and it is positive when it is odd and negative when it is even.

The number of 199 is positive.

Then the number is 1 397

3, let (2,-1) be a pair, and then (3,-1) ......So the 200th number is 100 pairs, because the first number of the first pair is 2, the first number of the second pair is 3, and so on, the 100th pair (i.e. the 199th number) is 101

To sum up, the 199th number is 101

4. It can be seen that 121121112 is a cycle, and there are 9 numbers with 2008 9=223 ...... 1

That is, there are 223 121121112 and an extra one1, where there are 3 in a cycle.

So the number of 2 is 223 3 = 669.

1. A: 35-(-10)=45m, B: 40-(-10)=50m2, single is positive, double is negative, so the 199th is positive;

By rollout rule: x=1 (2n-1);

The answer can be obtained: 1 in 397 (1 397).

3. After observation, it can be seen that even numbers are -1, and the law of double numbers is: x=(n-3) 2, so the answer is: 101

1.Add 10 for A 45m and B 50m respectively

2.Regular 1 (2*x-1), the 199th number should be 1 (2*199-1)=1 397

3.The 199th number x is followed by -1, adding up to 200 numbers in 100 groups, (2, -1) (3, -1) (4, -1) ......x,-1), the sum in parentheses is 1,2,3,4......By analogy, the last set of differences is 100, so x is 101

For a group, 9 numbers, 2008 9 = 223 remainder 1,223 group finally add 1, a group of 3 2, that is, 3 negative numbers, so there are 223 * 3 = 669 negative numbers.

It's purely to get points, it's really tiring to answer the questions, and write so many words.

1. The altitude of A is 45m and the altitude of B is 50m

1 in 2,201 (Does the first 1 count?) ）

4,669.

The altitude of the A is: 45m. The altitude of B is 50m

One in 397.

(-1) 2n=1 (2n is even, -1 is even=1)(-1) 2n+1=-1 (2n+1 is odd, -1 is odd and -1 is odd) (a-2) 2+|b+3|=0 b^a=(-3)^2=9s=1+2+2^2+2^3+..2^2008 s=2^2009-1