A few math problems! Very urgent! Today! 1, a can be divided by B, then the greatest common factor of a and B is () 2, a is a multiple of B, then the greatest common factor of a and B is () 3, a and B are prime, then the greatest common factor of a and B is () If 4, a and B are two consecutive positive integers, then the greatest common factor of a and B is () 5, number a = 3xax7, number b = 2x3xb, the greatest common factor of number a and number B is 21, then a is the minimum, B = The two prime numbers whose difference is 1 are () and (), and their greatest common factor is (). The two natural sums are 216. If their greatest common factor is 24, then these two numbers are () What are the two double digits of the product of two books equal to the product of 21x24 within 7 and 50? 8. A rectangular splint 2 meters long and 8 decimeters wide should be sawed into several squares with the same area as large as possible, and there is no surplus. How many pieces can this splint be sawed into? 9. On the Double Ninth Festival, the teachers and students of Xiangming middle school went to the nursing home to visit the elderly. They prepared 320 apples, 240 oranges and 200 pears to express their sympathy to the elderly. How many of the same gifts can they share with them? How many apples, oranges and pears are there in each gift?

If a is divisible by B, then the greatest common factor of a and B is (a)
2, a is a multiple of B, then the greatest common factor of a and B is (b)
3, a and B are prime, then the greatest common factor of a and B is (1)
If 4, a and B are two continuous positive integers, then the greatest common factor of a and B is (1)
5, a = 3xax7, B = 2x3xb, the greatest common factor of a and B is 21, then a can take (1), B = (7)
The two prime numbers with difference 1 are (2) and (3), and their greatest common factor is (1). The two natural sums are 216. If their greatest common factor is 24, then these two numbers are (24192)
What are the two double digits of the product of two books equal to the product of 21x24 within 7 and 50?
21*24=3*7*2*2*2*3=28*18=42*12=14*36.
8. A rectangular splint 2 meters long and 8 decimeters wide should be sawed into several squares with the same area as large as possible, and there is no surplus. How many pieces can this splint be sawed into?
2m=20dm
The greatest common factor of 20 and 8 is 4
Sawable (20 / 4) * (8 / 4) = 10 pieces
9. On the Double Ninth Festival, the teachers and students of Xiangming middle school went to the nursing home to visit the elderly. They prepared 320 apples, 240 oranges and 200 pears to express their sympathy to the elderly. How many of the same gifts can they share with them? How many apples, oranges and pears are there in each gift?
The greatest common factor of 320240 and 200 is 40
It can be divided into up to 40 of the same gifts
In each gift, apple 8, orange 6, pear 5

Divide the following eight numbers into two groups, and make the products of the two groups equal: 12, 18, 33, 35, 36, 65, 77104

12=2*2*3
18=2*3*3
33=3*11
35=5*7
36=3*2*2*3
65=5*13
77=7*11
104=2*2*2*13
Just divide the factors equally into two groups
The first group 65 * 77 * 36 * 12 = (5 * 13) (7 * 11) (3 * 2 * 2 * 3) (2 * 2 * 3) = 2162160
The second group 104 * 33 * 35 * 18 = (2 * 2 * 2 * 13) (3 * 11) (5 * 7) (2 * 3 * 3) = 2162160

8,10,14,18, () what numbers should be in brackets and why?

The answer is 26. It's about primes
2. 3, 5, 7, 11 prime sequence, multiplied by 2, is:
4. 6, 10, 14, 22 + 4
8、10、14、18、26

Calculation: 0.65 + (- 1.9) + (- 0.1) + (- 0.65)

The original formula is 0.65-1.9-0.1-0.65
＝﹙0.65－0.65）－﹙1.9＋0.1）
＝﹣2.

What is the next term of the sequence 1,0,9,26,65?

By recursion:
An = (n-1) ^ 3 + 1 (n is odd)
An = (n-1) ^ 3 - 1 (n is even)
After the merger:
an = (n-1)^3 + (-1)^(n+1)

0,9,26,65,124,( ) A.165 B.193 C.217 D.239

The law should be n & sup3; + (- 1) ^ n
I can't type it. It should be the third power of N plus the nth power of - 1
But the answer is C

The arrangement rule of 0 9 26 65 124 217

0(1x1x1-1)
9(2x2x2+1)
26(3x3x3-1)
65(4x4x4+1)
124(5x5x5-1)
217(6x6x6+1)

Sequence 9,10,65,26217（

Because 9 = 2 & # 179; + 1
10=3²+1
65=4³+1
26=5²+1
217=6³+1
So the next number should be 7 & # 178; + 1 = 50

0, 7, 26, 63, 124, how to calculate 124 in sequence?

Are the cubes of terms - 1
124=5³-1

Number reasoning 2,3,7,8,27,13, ()
It's a process

Multiply a by 5 and subtract B to get C
27*5-13=122