Thực hiện phép tính

To solve the expression given, we need to perform the calculations step by step.

### The expression to calculate:
\[
D = \frac{7}{4} \left( \frac{33}{12} + \frac{3333}{2020} + \frac{333333}{303030} + \frac{33333333}{42424242} \right)
\]

### Step 1: Calculate each fraction inside the parentheses

1. **First fraction**:
\[
\frac{33}{12} = 2.75
\]

2. **Second fraction**:
\[
\frac{3333}{2020} \approx 1.648
\]

3. **Third fraction**:
\[
\frac{333333}{303030} \approx 1.099
\]

4. **Fourth fraction**:
\[
\frac{33333333}{42424242} \approx 0.785
\]

### Step 2: Sum all the fractions

Now adding these results together:
\[
2.75 + 1.648 + 1.099 + 0.785 \approx 6.282
\]

### Step 3: Multiply by \(\frac{7}{4}\)

Now, we will calculate:
\[
D = \frac{7}{4} \times 6.282 \approx 10.922
\]

### Final Result
The value of \(D\) is approximately **10.922**.