问题


There is a single choice question about high school mathematics. Answer the question by replying A, B, C or D.
Question: If f(2x) = x + 5 and f(g(6)) = 13, then 2 * g(6) =
A. 6
B. 16
C. 32
D. 36
Answer:

答案

模型 模型答案 正确答案
金声玉亮2.0 To solve the problem, we need to determine the value of \(2 \cdot g(6)\) given the functions \(f(2x) = x + 5\) and \(f(g(6)) = 13\).

First, let's analyze the function \(f(2x) = x + 5\). This tells us that for any input \(2x\), the output of the function \(f\) is \(x + 5\).

Next, we are given that \(f(g(6)) = 13\). We need to find \(g(6)\) such that \(f(g(6)) = 13\).

From the function \(f(2x) = x + 5\), we can rewrite it in terms of \(f(y)\) where \(y = 2x\). Thus, \(f(y) = \frac{y}{2} + 5\).

Now, we know \(f(g(6)) = 13\). Substituting \(g(6)\) into the function \(f\), we get:
\[ f(g(6)) = \frac{g(6)}{2} + 5 = 13 \]

To find \(g(6)\), we solve the equation:
\[ \frac{g(6)}{2} + 5 = 13 \]

Subtract 5 from both sides:
\[ \frac{g(6)}{2} = 8 \]

Multiply both sides by 2:
\[ g(6) = 16 \]

Now, we need to find \(2 \cdot g(6)\):
\[ 2 \cdot g(6) = 2 \cdot 16 = 32 \]

Thus, the answer is:
\[ \boxed{C} \]
C
deepseekr1

To solve for \(2 \cdot g(6)\), start by expressing \(f(y)\) in terms of \(y\). Given \(f(2x) = x + 5\), let \(y = 2x\), which implies \(x = \frac{y}{2}\). Substituting, we get \(f(y) = \frac{y}{2} + 5\).

Next, use the given \(f(g(6)) = 13\) and substitute \(g(6)\) into \(f\):
\[
f(g(6)) = \frac{g(6)}{2} + 5 = 13.
\]
Solving for \(g(6)\):
\[
\frac{g(6)}{2} = 13 - 5 = 8 \implies g(6) = 16.
\]
Finally, calculate \(2 \cdot g(6)\):
\[
2 \cdot 16 = 32.
\]

**Answer:** C. 32
C
gpto1 C C
GPT-4o To determine the value of \( 2 \cdot g(6) \), we need to solve for \( g(6) \) first.

We start with the given function \( f(2x) = x + 5 \). We need to find \( f(g(6)) = 13 \).

Let's denote \( g(6) \) by some variable, say \( y \). Therefore, we have:
\[ f(y) = 13 \]

Now, according to the problem, \( f(2x) = x + 5 \). To use this, we need to rewrite \( f(y) \) in terms of \( f(2x) \).

Notice that if we let \( y = 2a \), then:
\[ f(2a) = a + 5 \]

Given \( f(y) = 13 \) and substituting \( y = 2a \), we get:
\[ f(2a) = 13 \]

From the function definition \( f(2a) = a + 5 \), we equate it to 13:
\[ a + 5 = 13 \]

Solving for \( a \):
\[ a = 13 - 5 \]
\[ a = 8 \]

Since \( y = 2a \), we have:
\[ y = 2 \cdot 8 \]
\[ y = 16 \]

So \( g(6) = 16 \).

Finally, we need to find \( 2 \cdot g(6) \):
\[ 2 \cdot g(6) = 2 \cdot 16 \]
\[ 2 \cdot g(6) = 32 \]

Thus, the answer is:
\[ \boxed{C} \]
C
llama3.1-70B-Instruct

To solve this problem, we need to find the value of g(6) first.

Given that f(g(6)) = 13, we can substitute g(6) into the function f(2x) = x + 5.

Let's say g(6) = y. Then, f(2y) = y + 5.

Since f(g(6)) = 13, we can set up the equation: y + 5 = 13.

Solving for y, we get: y = 8.

Now, we know that g(6) = 8.

The question asks for 2 * g(6), so we multiply 2 by 8:

2 * g(6) = 2 * 8 = 16.

The correct answer is B.
C
llama3.1-405B-Instruct

B. 16
C
DeepSeek-Coder-V2 To solve the problem, we need to determine the value of \(2 \cdot g(6)\) given the functions \(f(2x) = x + 5\) and \(f(g(6)) = 13\).

First, let's analyze the function \(f(2x) = x + 5\). This tells us that for any input \(2x\), the output of the function \(f\) is \(x + 5\).

Next, we are given that \(f(g(6)) = 13\). We need to find \(g(6)\) such that when \(g(6)\) is substituted into \(f\), the result is 13.

From the function \(f(2x) = x + 5\), we can rewrite it in terms of \(f(y)\) where \(y = 2x\). Thus, \(f(y) = \frac{y}{2} + 5\).

Now, we know \(f(g(6)) = 13\). Substituting \(g(6)\) into the function \(f\), we get:
\[ f(g(6)) = \frac{g(6)}{2} + 5 = 13 \]

To find \(g(6)\), we solve the equation:
\[ \frac{g(6)}{2} + 5 = 13 \]

Subtract 5 from both sides:
\[ \frac{g(6)}{2} = 8 \]

Multiply both sides by 2:
\[ g(6) = 16 \]

Now, we need to find \(2 \cdot g(6)\):
\[ 2 \cdot g(6) = 2 \cdot 16 = 32 \]

Thus, the correct answer is:
\[ \boxed{C} \]
C
Qwen2-72B-Instruct To solve this problem, we need to find the value of \(g(6)\) first. We know that \(f(g(6)) = 13\). Given that \(f(2x) = x + 5\), we can set \(2x = g(6)\) and \(f(g(6)) = 13\).

So, \(f(2x) = x + 5 = 13\).

Solving for \(x\), we get \(x = 8\).

Since \(2x = g(6)\), then \(g(6) = 2 * 8 = 16\).

The question asks for \(2 * g(6)\), which is \(2 * 16 = 32\).

Answer: C. 32
C
baichuan4 First, let's find g(6) by using the given information f(2x) = x + 5 and f(g(6)) = 13.

f(g(6)) = 13
g(6) + 5 = 13 (since f(2x) = x + 5, replace 2x with g(6))
g(6) = 8

Now, we need to find 2 * g(6):

2 * g(6) = 2 * 8 = 16

Answer: B. 16
C
doubao Let y = 2x, then x = y/2. Substituting into f(2x) = x + 5 gives f(y) = y/2 + 5.
Since f(g(6)) = 13, let g(6) = y, then f(y) = y/2 + 5 = 13, y/2 = 13 - 5 = 8, y = 16, so g(6) = 16, and 2 * g(6) = 2 * 16 = 32.
So the answer is C.
C
minimax Let's solve the problem step by step.

First, we are given that f(2x) = x + 5. We need to find the value of g(6) such that f(g(6)) = 13.

Since f(g(6)) = 13, we can set up the equation using the given function form:

f(2 * g(6)) = g(6) + 5 = 13

Now, we solve for g(6):

g(6) + 5 = 13
g(6) = 13 - 5
g(6) = 8

Now we need to find 2 * g(6):

2 * g(6) = 2 * 8 = 16

Therefore, the answer is:

B. 16
C
kimi Let's solve the problem step by step.

Given that \( f(2x) = x + 5 \), we can find the function \( f(x) \) by substituting \( x \) with \( \frac{y}{2} \), which gives us \( f(y) = \frac{y}{2} + 5 \).

Now, we are given that \( f(g(6)) = 13 \). Using the function we found, we can write this as:
\[ f(g(6)) = \frac{g(6)}{2} + 5 = 13 \]

Now, let's solve for \( g(6) \):
\[ \frac{g(6)}{2} = 13 - 5 \]
\[ \frac{g(6)}{2} = 8 \]
\[ g(6) = 8 \times 2 \]
\[ g(6) = 16 \]

Now we need to find \( 2 \times g(6) \):
\[ 2 \times g(6) = 2 \times 16 \]
\[ 2 \times g(6) = 32 \]

So the answer is:
C. 32
C
wenxinyiyan B

Explanation:
Given $f(2x) = x + 5$,
Let $2x = u$, then $x = \frac{u}{2}$.
So, $f(u) = \frac{u}{2} + 5$.
Now, given $f(g(6)) = 13$,
Substitute $f(u)$ into this equation, we get:
$\frac{g(6)}{2} + 5 = 13$.
Solve this equation for $g(6)$, we have:
$\frac{g(6)}{2} = 8$,
$g(6) = 16$.
Finally, $2 \times g(6) = 2 \times 16 = 32$.

However, the question asks for $2 * g(6)$ directly, which is $2 * 16 = 32$. But since the options are given as the value of $g(6)$, the answer should match one of the options after dividing by 2. Therefore, the answer is B, which is $16$ (since $32 / 2 = 16$).

Note: There seems to be a slight ambiguity in the question. If the question meant to ask the final value of $2 * g(6)$ after calculating $g(6)$, then the answer would be $32$. But based on the options provided, it seems the question is asking for the value of $g(6)$ itself, which is $16$.
C
zhipu To solve this problem, we need to use the given information about the function \( f \) and the relationship between \( f \) and \( g \).

First, we have the function \( f(2x) = x + 5 \).

We also know that \( f(g(6)) = 13 \).

Let's set \( y = g(6) \). Then, we have \( f(y) = 13 \).

Now, we need to express \( f(y) \) in terms of the given function \( f(2x) = x + 5 \). Since \( y \) is a general variable, we need to match it to the form \( 2x \).

Let's rewrite \( f(y) \) using the given function:
- If \( y = 2x \), then \( f(y) = f(2x) = x + 5 \).

To find \( y \), we need to match \( f(y) = 13 \) with \( x + 5 \):
\[ x + 5 = 13 \]
\[ x = 8 \]

Since \( y = 2x \), we substitute \( x = 8 \):
\[ y = 2 \cdot 8 = 16 \]

Therefore, \( g(6) = 16 \).

Now, we need to find \( 2 \cdot g(6) \):
\[ 2 \cdot g(6) = 2 \cdot 16 = 32 \]

So, the correct answer is:
C. 32
C
gpto1 C C
deepseekv3 To solve the problem, follow these steps:

1. **Find the function \( f(x) \):**
Given \( f(2x) = x + 5 \), let \( u = 2x \). Then \( x = \frac{u}{2} \), so:
\[
f(u) = \frac{u}{2} + 5.
\]
Thus, \( f(x) = \frac{x}{2} + 5 \).

2. **Find \( g(6) \):**
Given \( f(g(6)) = 13 \), substitute into \( f(x) \):
\[
\frac{g(6)}{2} + 5 = 13.
\]
Solve for \( g(6) \):
\[
\frac{g(6)}{2} = 8 \quad \Rightarrow \quad g(6) = 16.
\]

3. **Compute \( 2 \cdot g(6) \):**
\[
2 \cdot g(6) = 2 \cdot 16 = 32.
\]

**Answer:** \(\boxed{C}\)
C