The greatest common divisor of two positive integers is 6, and the least common multiple is 90? There are five options A, 0 B, 1 C, 2 D, 3 e. Countless

The greatest common divisor of two positive integers is 6, and the least common multiple is 90? There are five options A, 0 B, 1 C, 2 D, 3 e. Countless

90=6*15
15=1*3*5
There are two pairs
6 * 15 = 90 and 6
6 * 5 = 30 and 6 * 3 = 18
Choose C
6 and 84
12 and 78
18 and 72
24 and 66
30 and 60
36 and 54
42 and 48
Seven pairs in all
Since the least common multiple of two numbers is 90, they must be divisors of 90.
Divide 90 factors into 90 = 1 × 90 = 2 × 45 = 3 × 30 = 5 × 18 = 6 × 15 = 9 × 10
Therefore, two numbers must be in the set: {1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90}
Since the greatest common divisor of two numbers is 6, two numbers must be multiples of 6
{6、18、30、90}
According to the question
Since the least common multiple of two numbers is 90, they must be divisors of 90.
Divide 90 factors into 90 = 1 × 90 = 2 × 45 = 3 × 30 = 5 × 18 = 6 × 15 = 9 × 10
Therefore, two numbers must be in the set: {1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90}
Since the greatest common divisor of two numbers is 6, two numbers must be multiples of 6
{6、18、30、90}
According to the meaning of the title, there are two groups of combinations that meet the conditions: {90, 6}, {30, 18}
So the answer is C. Put it away
Two groups, 90 and 6, 18 and 15, so choose C
A
The least common multiple is 90
Then consider the divisor of 90, 90 = 2 * 3 * 3 * 5 = 6 * 3 * 5
If the least common divisor is 6, then the number is 6, 6 * 3 = 18, 6 * 5 = 30, and 90
The conditions are 6, 18, 30 and 90
How many pairs are there in the first pair of large numbers composed of two positive integers that satisfy the condition?
That is to say, there are several pairs of large numbers in front of the two numbers
Yes, 90-6, 30-18, just two, right
None of the others are right. 18-6... Unfold
The least common multiple is 90
Then consider the divisor of 90, 90 = 2 * 3 * 3 * 5 = 6 * 3 * 5
If the least common divisor is 6, then the number is 6, 6 * 3 = 18, 6 * 5 = 30, and 90
The conditions are 6, 18, 30 and 90
How many pairs are there in the first pair of large numbers composed of two positive integers that satisfy the condition?
That is to say, there are several pairs of large numbers in front of the two numbers
Yes, 90-6, 30-18, just two, right
The others are wrong. The least common multiple of 18-6 is 18, the least common multiple of 30-6 is 30, the least common divisor of 90-18 is 18, and the least common divisor of 90-30 is 30
The greatest common divisor of two positive integers is 6, and the least common multiple is 90. How many pairs of large numbers of two positive integers that satisfy the condition are there in total?
Let two numbers be x, y. The greatest common divisor of two positive integers is 6: let two coefficients a and B make x = 6 * a, y = 6 * B -------- (1) the least common multiple is 90: let two coefficients m and n make 90 = x * m, 90 = y * n -------- (2) take (1) into (2) to get a * m = b * n = 15 --------
The greatest common divisor of two numbers is 15, and the least common multiple is 90. What are the two numbers!
90÷15=6
Because 6 = 1 × 6 = 2 × 3
So these two numbers are: 1 × 15 = 15 and 6 × 15 = 90
Or these two numbers are: 2 × 15 = 30 and 3 × 15 = 45
30,45
The greatest common divisor of the two numbers is 15 and the least common multiple is 90. These two numbers are 30 and 45 or 15 and 90 respectively
The greatest common divisor is 15 and the least common multiple is 90. These two numbers are () or ()
30 75
90 15
90, 15 or 30, 45
The greatest common factor of the two numbers is 9, and the least common multiple is 90_____ Or______
most urgent,
The greatest common factor of the two numbers is 9, and the least common multiple is 90_ 9,90____ Or_ 18,45_____
90/9=10=1*10=2*5
1*9=9
10*9=90
2*9=18
5*9=45
The greatest common factor of the two numbers is 9, and the least common multiple is 243______ And______ .
9 = 3 × 3243 = 3 × 3 × 3 × 3, these two numbers are 9 and 243, so the answer is: 9243
What are even numbers, composite numbers, odd numbers, prime numbers
The concept of even number: in an integer, the number divisible by 2 is even number (that is, the even number is spoken by people), otherwise it is odd number (that is, the singular number is spoken by people). Special tips: even number includes positive even number, negative even number and 0. Even number = 2K, odd number = 2k-1 (or + 1), where k is an integer
Composite number refers to: 1) the product of the two numbers whose greatest common divisor between two numbers is only 1; 2) the common divisor between two numbers is not only 1, which can be divided by multiplying one of the divisors by the smallest number. The multiplied number is composite number, also known as composite number. It is a positive integer satisfying any of the following (equivalent) conditions: 1. It is the product of two integers greater than 1; 2. Have a factor (factor) greater than 1 but less than itself; 3. Have at least three factors (factors); 4. Neither 1 nor prime number (prime number); 5. Non prime number with at least one prime factor. 6. The product of two or more prime numbers can form a composite number, and only one composite number. Conversely, a composite number can be divided into a group of prime numbers, In other words, a composite number composed of the products of more than three prime numbers can not be regarded as the product of two prime numbers! (it can also be said that there are other factors besides 1 and itself)
In odd integers, the number that can be divided by 2 is even, and the number that cannot be divided by 2 is odd. Even numbers can be represented by 2K, odd numbers can be represented by 2K + 1, where k is an integer. Special tips: odd numbers include positive odd numbers and negative odd numbers
Prime number is also called prime number. It refers to the number in a natural number greater than 1 which can not be divided by other natural numbers except 1 and the integer itself. In other words, natural numbers with only two positive factors (1 and itself) are prime numbers. Numbers larger than 1 but not prime numbers are called composite numbers. 1 and 0 are neither prime nor composite numbers
Even: an integer divisible by two
Odd: an integer that cannot be divided by two
Composite number: a natural number that can be divided by other numbers except 1 and itself
Prime number: a natural number that cannot be divided by other numbers except 1 and itself
Even numbers are divisible by two
Odd numbers are not divisible by two
Prime numbers are numbers without a common divisor, such as 23 5 7 11 13 and so on
A composite number is a common divisor, such as 24 6 8 10 12 15
An even number is a multiple of two
An odd number is a number that is not a multiple of 2
Composite number refers to a number in addition to its own and one, there are other factors called composite number
A prime number is a number that has no other factors than itself and one
Some problems about prime number, composite number, odd number and even number
1. Prime number
2. Total number
3. Odd number
4. Even number
5. Multiple characteristics of 2
6. Multiple characteristics of 3
7. Multiple characteristics of 5
8. Prime numbers within 100
9. Write all the factors of the following numbers
12：（ ）
18：（ ）
24：( ）
36：（ ）
42:( )
1. Prime numbers have no factors other than zero and themselves
2. The sum has other factors besides zero and itself
3. An odd number that cannot be divided by two
4. An even number divisible by two
5. The end number of the multiple characteristic of 2 is one of 0,2,4,6,8
6. The sum of each digit is a multiple of 3
7. The end number of the multiple characteristic of 5 is 0 or 5
8. Prime numbers within 100 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
9. Write all the factors of the following numbers
12：（1,2,3,4,6,12 ）
18：（1,2,3,6,9,18 ）
24：(1,2,3,4,6,8,12,24 ）
36：（1,2,3,4,6,9,12,18,36 ）
42:( 1,2,3,6,7,14,21,42)
Prime, composite, odd and even numbers
1、 Qualitative, combined, odd and even numbers
I
What is prime_________________________________
What is the total number____________________________________
What is the odd number_____________________________________
What is an even number_______________________________________
II
① Both are even numbers, () and ()
② Both are composite numbers, () and ()
③ One is prime, one is composite, () and ()
III
Prime, composite, even and odd numbers within 100
2
Common multiple and common factor
I
What is the common factor_____________________________
What is the common multiple_______________________________
II
What is the solution quality factor?
III
The formula of common factor and common multiple
A number that has no other factors except one and itself is called a prime number
A number with other factors besides one and itself is called a composite number
A number that cannot be divided by two is called an odd number
A number divisible by two is called an even number
2 and 4
4 and 6
2 and 4
Prime numbers within 100: 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 91 97
Sum: all positive integers except 1, 0 and the above prime numbers
Even number: 0 2 4 6 8 10 98 (increasing by 2)
Odd number: 1 3 5 7 9 11 99 (increasing by 2)
In two or more natural numbers, if they have the same factors, then these factors are called their common factors
In two or more natural numbers, if they have the same multiples, then these multiples are called their common multiples
Decomposing a composite number into the product of several prime numbers
A number that has no other factors except one and itself is called a prime number
A number with other factors besides one and itself is called a composite number
A number that cannot be divided by two is called an odd number
Within 20______ It's even and prime______ It is an odd number and a composite number. The product of the two numbers is______ .
Among the numbers within 20, 2 is both even and prime; 9 and 15 are both odd and composite. The product of these two numbers is: 9 × 15 = 135. So the answer is: 2, 9, 15135