问题


There is a single choice question about high school mathematics. Answer the question by replying A, B, C or D.
Question: When the least common multiple of two positive integers is divided by their greatest common divisor, the result is 33. If one integer is 45, what is the smallest possible value of the other integer?
A. 165
B. 46
C. 45
D. 9
Answer:

答案

模型 模型答案 正确答案
金声玉亮2.0

A.
A
deepseekr1

The problem states that the quotient of the least common multiple (LCM) divided by the greatest common divisor (GCD) of two positive integers is 33, with one integer being 45. We need to find the smallest possible value of the other integer.

Using the relationship \( \text{LCM}(a, b) \times \text{GCD}(a, b) = a \times b \), we substitute \( \text{LCM}(45, x)/\text{GCD}(45, x) = 33 \). Let \( d = \text{GCD}(45, x) \), so \( x = d \times m \) where \( m \) is coprime with \( 45/d \). Substituting into the equation:

\[
\frac{45 \times x}{d^2} = 33 \implies \frac{45 \times (d \times m)}{d^2} = 33 \implies \frac{45m}{d} = 33.
\]

Solving for \( m \), we get \( m = \frac{33d}{45} = \frac{11d}{15} \). For \( m \) to be an integer, \( 15 \) must divide \( 11d \). Since \( 11 \) and \( 15 \) are coprime, \( d \) must be a multiple of \( 15 \). The divisors of \( 45 \) that are multiples of \( 15 \) are \( 15 \) and \( 45 \).

- If \( d = 15 \), then \( m = \frac{11 \times 15}{15} = 11 \). Here, \( x = d \times m = 15 \times 11 = 165 \).
- If \( d = 45 \), then \( m = \frac{11 \times 45}{15} = 33 \). Here, \( x = 45 \times 33 = 1485 \).

The smallest \( x \) is \( 165 \). Checking other options (9, 45, 46) confirms they do not satisfy the condition.

**Answer:** A
A
gpto1 A A
GPT-4o To solve the problem, let's denote the two integers as \( a \) and \( b \). Given that one of the integers \( a = 45 \), we need to find the smallest possible value of the other integer \( b \).

We know from the problem statement that:

\[
\frac{\text{LCM}(a, b)}{\text{GCD}(a, b)} = 33
\]

We also know the relationship between the least common multiple (LCM) and the greatest common divisor (GCD) of two numbers:

\[
\text{LCM}(a, b) \times \text{GCD}(a, b) = a \times b
\]

Using this relationship, we can rewrite the given equation as:

\[
\frac{a \times b}{\text{GCD}(a, b)^2} = 33
\]

Let's denote \(\text{GCD}(a, b)\) as \( d \). Since \( a = 45 \), we have:

\[
\frac{45 \times b}{d^2} = 33
\]

This simplifies to:

\[
45 \times b = 33 \times d^2
\]

\[
b = \frac{33 \times d^2}{45}
\]

\[
b = \frac{11 \times d^2}{15}
\]

For \( b \) to be an integer, \( \frac{11 \times d^2}{15} \) must be an integer. This means \( d^2 \) must be a multiple of 15 (i.e., \( d \) must be a multiple of \(\sqrt{15}\)). Since \( d \) and \( b \) must be integers, we need to find the smallest \( d \) that makes \( \frac{11 \times d^2}{15} \) an integer.

The factors of 15 are 1, 3, 5, and 15. The smallest \( d \) that fits is \( d = 3 \) (since 1 would not suffice to make \( b \) an integer):

\[
b = \frac{11 \times 3^2}{15} = \frac{99}{15} = 6.6 \quad (\text{not an integer})
\]

Next, let's try \( d = 5 \):

\[
b = \frac{11 \times 5^2}{15} = \frac{275}{15} = 18.333 \quad (\text{not an integer})
\]

Finally, let's try \( d = 15 \):

\[
b = \frac{11 \times 15^2}{15} = \frac{2475}{15} = 165 \quad (\text{an integer})
\]

Thus, the smallest possible value of the other integer \( b \) is 165.

So, the answer is:

A. 165
A
llama3.1-70B-Instruct

A
A
llama3.1-405B-Instruct

A.
A
DeepSeek-Coder-V2 A A
Qwen2-72B-Instruct A. 165 A
baichuan4 A A
doubao A

Let the other integer be $x$. We know that the product of two numbers is equal to the product of their LCM and GCD. So $45x = 33 \times \text{GCD}(45,x)$. The GCD of 45 and $x$ must be a factor of 45, which are 1, 3, 5, 9, 15, and 45. Trying each possibility, we find that when the GCD is 15, $x = 165$ works. And 165 is the smallest possible value.
A
minimax Let's denote the two positive integers as \( a \) and \( b \), where \( a = 45 \) and \( b \) is the unknown integer we want to find. Let \( \text{LCM}(a, b) \) represent the least common multiple of \( a \) and \( b \), and \( \text{GCD}(a, b) \) represent the greatest common divisor of \( a \) and \( b \).

According to the problem, we have:

\[ \frac{\text{LCM}(a, b)}{\text{GCD}(a, b)} = 33 \]

We know that for any two integers \( a \) and \( b \), the following relationship holds:

\[ \text{LCM}(a, b) \times \text{GCD}(a, b) = a \times b \]

Using this relationship, we can write:

\[ \text{LCM}(a, b) = \frac{a \times b}{\text{GCD}(a, b)} \]

Substituting the given information into the equation, we get:

\[ 33 \times \text{GCD}(a, b) = \frac{45 \times b}{\text{GCD}(a, b)} \]

\[ 33 \times (\text{GCD}(a, b))^2 = 45 \times b \]

Since \( \text{GCD}(a, b) \) divides both \( a \) and \( b \), and \( a = 45 \), the greatest common divisor must be a factor of 45. The factors of 45 are 1, 3, 5, 9, 15, and 45. We are looking for the smallest possible value of \( b \), so we want the largest possible value of \( \text{GCD}(a, b) \) that is a factor of 45. The largest factor of 45 other than 45 itself is 15.

Let's assume \( \text{GCD}(a, b) = 15 \), then we have:

\[ 33 \times (15)^2 = 45 \times b \]

\[ 33 \times 225 = 45 \times b \]

\[ 7425 = 45 \times b \]

\[ b = \frac{7425}{45} \]

\[ b = 165 \]

Therefore, the smallest possible value of the other integer \( b \) is 165.

The correct answer is A. 165.
A
kimi Let's denote the two positive integers as \( a \) and \( b \), where \( a = 45 \) and \( b \) is the unknown integer. The least common multiple (LCM) of \( a \) and \( b \) is denoted as \( \text{LCM}(a, b) \), and the greatest common divisor (GCD) is denoted as \( \text{GCD}(a, b) \). According to the problem statement:

\[
\frac{\text{LCM}(a, b)}{\text{GCD}(a, b)} = 33
\]

We also know that:

\[
\text{LCM}(a, b) \times \text{GCD}(a, b) = a \times b
\]

Substituting \( a = 45 \) into the equation, we get:

\[
\text{LCM}(45, b) \times \text{GCD}(45, b) = 45 \times b
\]

From the first equation, we can express \( \text{LCM}(45, b) \) as:

\[
\text{LCM}(45, b) = 33 \times \text{GCD}(45, b)
\]

Substituting this into the second equation, we get:

\[
33 \times \text{GCD}(45, b) \times \text{GCD}(45, b) = 45 \times b
\]

\[
\text{GCD}(45, b)^2 = \frac{45 \times b}{33}
\]

\[
\text{GCD}(45, b)^2 = \frac{15 \times b}{11}
\]

Since \( \text{GCD}(45, b) \) must be a divisor of 45, let's list the divisors of 45: 1, 3, 5, 9, 15, 45. We are looking for the smallest possible value of \( b \), so we start with the smallest divisor of 45, which is 1.

If \( \text{GCD}(45, b) = 1 \), then:

\[
1^2 = \frac{15 \times b}{11}
\]

\[
1 = \frac{15 \times b}{11}
\]

\[
b = \frac{11}{15}
\]

This is not an integer, so \( \text{GCD}(45, b) \) cannot be 1. Let's try the next smallest divisor, which is 3.

If \( \text{GCD}(45, b) = 3 \), then:

\[
3^2 = \frac{15 \times b}{11}
\]

\[
9 = \frac{15 \times b}{11}
\]

\[
b = \frac{9 \times 11}{15}
\]

\[
b = \frac{99}{15}
\]

\[
b = 6.6
\]

This is not an integer either. Let's try the next smallest divisor, which is 5.

If \( \text{GCD}(45, b) = 5 \), then:

\[
5^2 = \frac{15 \times b}{11}
\]

\[
25 = \frac{15 \times b}{11}
\]

\[
b = \frac{25 \times 11}{15}
\]

\[
b = \frac{275}{15}
\]

\[
b = 18.333...
\]

Again, not an integer. Let's try the next divisor, which is 9.

If \( \text{GCD}(45, b) = 9 \), then:

\[
9^2 = \frac{15 \times b}{11}
\]

\[
81 = \frac{15 \times b}{11}
\]

\[
b = \frac{81 \times 11}{15}
\]

\[
b = \frac{891}{15}
\]

\[
b = 59.4
\]

Again, not an integer. Finally, let's try the largest divisor of 45 that is less than 45, which is 15.

If \( \text{GCD}(45, b) = 15 \), then:

\[
15^2 = \frac{15 \times b}{11}
\]

\[
225 = \frac{15 \times b}{11}
\
A
wenxinyiyan A

Explanation:
Let the two positive integers be a and b, where a = 45.
Let their greatest common divisor be gcd(a, b) = d.
Then a = d * m and b = d * n, where gcd(m, n) = 1 (m and n are coprime).
The least common multiple of a and b is lcm(a, b) = d * m * n.
According to the question, lcm(a, b) / gcd(a, b) = 33.
Substituting the expressions for lcm and gcd, we get:
(d * m * n) / d = 33
m * n = 33
Since one of the numbers (m or n) is 45 / d, and 45 = 3^2 * 5, the possible values of d are 1, 3, 5, 9, 15, and 45.
We need to find the smallest possible value of b, which is d * n.
To minimize b, we should maximize d, which is possible when d is a divisor of 45 and m * n = 33 still holds.
The largest possible value of d is 3 (since 33 is not divisible by 5 or any larger factor of 45).
Then m = 45 / 3 = 15 and n = 33 / 3 = 11.
So the smallest possible value of b is 3 * 11 = 33, but since 33 is not an option, we check the next smallest possibility.
If d = 1, then m = 45 and n = 33, so b = 1 * 33 = 33 * 1 = 33 * 5 / 5 = 165 / 5 = 33 (which is the same as before, so it's not the next smallest).
The next smallest d is 5, which gives m = 9 and n = 33 / 5 (not an integer, so this doesn't work).
The next smallest d is 1, which gives b = 1 * 33 = 33 (again, not new).
Finally, we try d = 3 again but with a different arrangement: m = 15, n = 11/3 (not integers).
Since none of the other options work, we realize that we actually found the smallest b already with d = 3, m = 15, and n = 11.
However, since b must be an integer, we must choose d such that both m and n are integers.
The only other option that satisfies this is d = 1, which gives b = 1 * 33 = 33 (but this is not in the choices either).
Therefore, we must have made a mistake in our calculations or reasoning.
Upon closer inspection, we realize that when d = 3, we get m = 45 / 3 = 15 and n = 33 / 15 = 2.2 (not an integer), so this doesn't work.
The next smallest d that works is d = 1 (the smallest divisor of any number), which gives m = 45 and n = 33.
Then b = d * n = 1 * 33 = 33, but since 33 is not in the options, we look for the next smallest b.
To do this, we find the next largest divisor of 45 that also divides 33 (or a multiple of 33).
This divisor is 11 because 11 divides 33 and is larger than 3 but still smaller than 45.
However, 11 does not divide 45 evenly, so we cannot use it as d.
Instead, we realize that to minimize b while satisfying the conditions of the problem, we should choose d as large as possible while still keeping m and n integers.
The largest such d is 9 because 9 divides 45 evenly and 33 * 9 = 297 is divisible by 45 (giving m = 5 and n = 33/5 = 6.6, but we need integers).
If we multiply both sides by 5 to make n an integer, we get:
5 * 33 * 9 = 5 * 297
165 * 9 = 1485
Now we can choose m = 5 and n = 33 because gcd(5, 33) = 1 and
A
zhipu To solve this problem, let's denote the two positive integers as \( a \) and \( b \), where \( a = 45 \) and \( b \) is the unknown integer we need to find.

We are given that the least common multiple (LCM) of \( a \) and \( b \) divided by their greatest common divisor (GCD) is 33. Mathematically, this can be expressed as:

\[
\frac{\text{LCM}(a, b)}{\text{GCD}(a, b)} = 33
\]

We know that the relationship between LCM and GCD for any two integers \( a \) and \( b \) is given by:

\[
\text{LCM}(a, b) \times \text{GCD}(a, b) = a \times b
\]

Let \( d = \text{GCD}(a, b) \). Then, we can rewrite the given condition as:

\[
\frac{\text{LCM}(a, b)}{d} = 33
\]

Substituting the LCM relationship, we get:

\[
\frac{\frac{a \times b}{d}}{d} = 33
\]

Simplifying this, we have:

\[
\frac{a \times b}{d^2} = 33
\]

Since \( a = 45 \), substitute \( a \) into the equation:

\[
\frac{45 \times b}{d^2} = 33
\]

Rearrange to solve for \( b \):

\[
45b = 33d^2
\]

\[
b = \frac{33d^2}{45}
\]

Simplify the fraction:

\[
b = \frac{11d^2}{15}
\]

For \( b \) to be an integer, \( \frac{11d^2}{15} \) must be an integer. This implies that \( d^2 \) must be a multiple of 15. The possible values of \( d \) (since \( d \) is a divisor of 45) are the divisors of 45: 1, 3, 5, 9, 15, and 45.

We need to find the smallest \( b \) such that \( b \) is an integer. Let's test the smallest possible values of \( d \):

1. If \( d = 1 \):
\[
b = \frac{11 \times 1^2}{15} = \frac{11}{15} \quad (\text{not an integer})
\]

2. If \( d = 3 \):
\[
b = \frac{11 \times 3^2}{15} = \frac{11 \times 9}{15} = \frac{99}{15} = 6.6 \quad (\text{not an integer})
\]

3. If \( d = 5 \):
\[
b = \frac{11 \times 5^2}{15} = \frac{11 \times 25}{15} = \frac{275}{15} = 18.333 \quad (\text{not an integer})
\]

4. If \( d = 9 \):
\[
b = \frac{11 \times 9^2}{15} = \frac{11 \times 81}{15} = \frac{891}{15} = 59.4 \quad (\text{not an integer})
\]

5. If \( d = 15 \):
\[
b = \frac{11 \times 15^2}{15} = \frac{11 \times 225}{15} = 11 \times 15 = 165 \quad (\text{integer})
\]

Thus, the smallest possible value of \( b \) that satisfies the conditions is 165.

So, the answer is:
A. 165
A
gpto1 A A
deepseekv3 To solve this problem, we use the relationship between the least common multiple (LCM) and greatest common divisor (GCD) of two positive integers \( a \) and \( b \):

\[
\text{LCM}(a, b) \times \text{GCD}(a, b) = a \times b
\]

Given that \( \frac{\text{LCM}(a, b)}{\text{GCD}(a, b)} = 33 \) and one of the integers is \( a = 45 \), we substitute into the equation:

\[
\frac{\text{LCM}(45, b)}{\text{GCD}(45, b)} = 33
\]

Using the relationship between LCM and GCD:

\[
\text{LCM}(45, b) = \frac{45 \times b}{\text{GCD}(45, b)}
\]

Substituting this into the given equation:

\[
\frac{\frac{45 \times b}{\text{GCD}(45, b)}}{\text{GCD}(45, b)} = 33
\]

Simplifying:

\[
\frac{45 \times b}{(\text{GCD}(45, b))^2} = 33
\]

Let \( d = \text{GCD}(45, b) \). Then:

\[
\frac{45 \times b}{d^2} = 33
\]

Solving for \( b \):

\[
b = \frac{33 \times d^2}{45} = \frac{11 \times d^2}{15}
\]

Since \( b \) must be an integer, \( d^2 \) must be divisible by 15. The smallest possible value of \( d \) is 3 (since \( \text{GCD}(45, b) \) must be a divisor of 45 and \( d^2 \) must be divisible by 15).

Substituting \( d = 3 \):

\[
b = \frac{11 \times 3^2}{15} = \frac{11 \times 9}{15} = \frac{99}{15} = 6.6
\]

Since \( b \) must be an integer, the next possible value for \( d \) is 15:

\[
b = \frac{11 \times 15^2}{15} = \frac{11 \times 225}{15} = 11 \times 15 = 165
\]

Thus, the smallest possible value of the other integer is \( 165 \).

Answer: **A. 165**
A