To convert the entire expression to a decimal, we'll follow these steps:

### Given Expression:
\[
\left(\frac{4}{90} - 0.7 + 1.7\overline{1}\right)
\]

### Step 1: Convert the Fraction \(\frac{4}{90}\) to a Decimal
\[
\frac{4}{90} = 0.0444\overline{4} \quad \text{(repeating decimal)}
\]

### Step 2: Understand the Decimal Values
- \( 0.7 \) is already a decimal.
- \( 1.7\overline{1} \) is a repeating decimal, which means:
  \[
  1.7\overline{1} = 1.71111\ldots
  \]

### Step 3: Perform the Arithmetic
- **Subtract \(0.7\) from \(0.0444\overline{4}\)**:
  \[
  0.0444\overline{4} - 0.7 = -0.6555\overline{5}
  \]
  
- **Add \(1.7\overline{1}\) to the result**:
  \[
  -0.6555\overline{5} + 1.7\overline{1} = 1.0555\overline{5}
  \]

### Final Answer:
The entire expression as a decimal is approximately:

\[
\boxed{1.0555\overline{5}}
\]

This represents a repeating decimal where the digits "5555..." repeat indefinitely.

Would you like further clarification or more details on the steps?

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**Related Questions**:
1. How do you handle subtraction and addition of repeating decimals?
2. Can you convert a repeating decimal back into a fraction?
3. How can repeating decimals be expressed more compactly in calculations?
4. What are some practical examples where repeating decimals are used?
5. How does rounding affect repeating decimals in calculations?

**Tip**: When dealing with repeating decimals in calculations, be cautious of rounding errors that may affect your final answer.

Discover how to convert the given expression to a decimal with a detailed step-by-step guide. This problem covers decimal conversion, handling repeating decimals, and performing arithmetic operations. Suitable for students in Grades 9-12.

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