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Several mathematical concept problems in junior high school
1. Regarding the quadratic polynomial of X, the coefficients of other terms are all 0 after simplification, that is, k=2 or 0, but when it is 2, the final result is all 0, so k=0.

2. Not included, that is, if the simplified coefficient is 0, then m (you should ask m) =4.

3. It has nothing to do with XY, but depends on the coefficient in front of them. It doesn't matter if it is 0.

Question 3. The algebraic expression-3x2y-10x3+6x2y-6x3y+7x3-2 is simplified to 3x 2y-9x 3-2. Then why is this only about X? There are also XY terms, aren't they all related to XY? Are there any conditions that have not been written down? The result can be 3x 2 (y-3x)-2. See if there are any other conditions.

4. The concrete analysis of this specific situation is better. As long as you are careful not to forget to enter 1, you can usually make what is left out.

5. Quote the answer of the last netizen.

In fact, it is best to fill in the Rubik's cube.

Put 1 in the middle of the first line.

Put 2

three

four

Fill in the upper right corner in turn.

If you go out of bounds from above,

Fill it at the bottom of the column.

If you come out from the right

Fill in to the far left of the line.

If there is already a number in the upper right corner

Don't fill it in the upper right corner

Fill in a box at the bottom of him.

Then continue to follow the rules.

This can be done in less than 10 second.

Not just 3- medium.

5 interfaces

7 parity odd parity applies.

When I say 1, I mean the smallest of those numbers.

For example, he gave 3.

four

five

six

seven

eight

nine

10

1 1

Put 3 in the middle of the first row.

You can try it yourself if you are interested.

6. Decimal Decimal Decimal → Binary Decimal: (1) Decimal Decimal number is multiplied by 2 to get the product, and the integer part of the product is taken out; (2) multiplying the decimal part of the product by 2 to obtain the product, and extracting the integer part of the product; (3) repeat step 2; (4) Every integer part put forward in the process of multiplying by 2 constitutes the converted binary decimal. Rules for determining weights: the first integer is the highest digit of binary decimal system.