It is known that the sum of 2m of the monomial - 2x & # 179; y and N-1 of 3x to the fourth power of Y is a monomial, so the value of Mn can be obtained

It is known that the sum of 2m of the monomial - 2x & # 179; y and N-1 of 3x to the fourth power of Y is a monomial, so the value of Mn can be obtained

It is known that the sum of the fourth power of 2m of - 2x & # y and N-1 y of 3x is a monomial,
n-1=3 n=4
2m=4 m=2
Mn = 8

Please write a monomial - the third term of 2 / X multiplied by y

The answer is not unique
x³y

Finding the square of cos α minus the range of sin α

y=cos²x－sinx
=1－sin²x－sinx
=－(sinx＋1/2)²＋5/4
The maximum is 5 / 4, the minimum is - 1, and the range is [- 1,5 / 4]

In a division formula, the divisor is five times the divisor, and the divisor is seven times the quotient. What's the formula?

35/7=5

The natural numbers are arranged according to the rule of the number table, and the natural number 2000 is in the first group, the second group 234 and the third group 5678····
The fourth group 9 10 11 12 13 the fifth group 14 15 16 17 18 19
The sixth group 20 21 22 23 24 25 26 the seventh group 27 28 29 30 31 32 33 34

Starting from the second group, the number of digits is an arithmetic sequence, and the first item is 3 tolerance 1. Except for 12000 in the first group, it should be the 1999 number, and only needs to meet (3 + 3 + n-1) * n / 2

All unnatural numbers are multiples of 1

Wrong 2 is twice 1, but 2 is a natural number

Find the rule 5.7.12.19.31 () ()
5.7.12.19.31（ ）（ ）

5+7=12
7+12=19
12+19=31
19+31=50
31+50=81
50,81

The sum of four consecutive natural numbers is a three digit number between 400 and 440, and the sum can be divisible by 9. It is necessary to find the four consecutive natural numbers______ 、______ 、______ 、______ ．

According to the above analysis, only 414 numbers can be divided by 9 between 400 and 440. Let the minimum natural number be X. according to the meaning of the question, we get x + X + 1 + X + 2 + X + 3 = 414, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 4x + 6 = 414, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 4x = 414-6, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 408 △ 4, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 102, x + 1 = 102 + 1 = 103, x + 2 = 102 + 2 = 104, x + 3 = 102 + 3 = 105. A: these four continuous natural numbers are 102103104105. So the answer is: 102103104105

Square root calculation method (without calculator)
For example, what is the fourth root of 4?

I heard that the teacher had this before, but now it's cancelled! Just remember the integer square of 1-20, the other one is just to understand, and don't care about it at all! Don't worry about it!

There is a batch of goods in the warehouse. The weight ratio of the goods transported away and the remaining goods is 2:7. If another 64 tons are transported away, the remaining goods will be recovered

The conditions are not sufficient and cannot be solved