Form expressions using t and 4. Use not more than one number operation. Every expression must have t in it.

Answer

To solve the problem of forming expressions using \( t \) and \( 4 \) with not more than one number operation, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the operations**: The basic arithmetic operations we can use are addition (+), subtraction (-), multiplication (×), and division (÷).

2. **Form expressions with addition**:
- We can add \( t \) and \( 4 \):
\[ t + 4 \]
- We can also write it as:
\[ 4 + t \]
- Both expressions are equivalent.

3. **Form expressions with subtraction**:
- We can subtract \( 4 \) from \( t \):
\[ t - 4 \]
- We can also write it as:
\[ 4 - t \]
- These two expressions will yield different results.

4. **Form expressions with multiplication**:
- We can multiply \( t \) and \( 4 \):
\[ t \times 4 \quad \text{or simply} \quad 4t \]
- The order does not matter here, so \( 4 \times t \) is also valid.

5. **Form expressions with division**:
- We can divide \( t \) by \( 4 \):
\[ \frac{t}{4} \]
- We can also divide \( 4 \) by \( t \):
\[ \frac{4}{t} \]
- These two expressions will yield different results unless \( t \) is equal to \( 4 \).

### Summary of Expressions:
1. \( t + 4 \)
2. \( 4 + t \)
3. \( t - 4 \)
4. \( 4 - t \)
5. \( t \times 4 \) or \( 4t \)
6. \( \frac{t}{4} \)
7. \( \frac{4}{t} \)