 [-3-4-(-1)] (-3:-1)・(-21) 2-1)]: [7-6+4.3]}


It seems like you've entered a combination of numbers, symbols, and possibly some misformatted expressions. Let's try to break it down step by step and identify the correct operations. Here’s my interpretation of your input:

- **[-3 - 4 - (-1)]** is a subtraction and negation operation.
- **(-3 : -1)** may be interpreted as division.
- **・(-21)** looks like a multiplication by -21.
- **(2 - 1)** is a simple subtraction.
- **[7 - 6 + 4.3]** involves basic arithmetic inside brackets.

### Rewriting the expression step by step:
\[ [-3 - 4 - (-1)] \times (-3 \div -1) \times (-21) \times (2 - 1) \times [7 - 6 + 4.3] \]

Let’s break it down and solve:

1. **[-3 - 4 - (-1)]**:
   \[
   = -

[-3-4-(-1)] (-3:-1)・(-21) 2-1)]: [7-6+4.3]}

Learn how to solve the arithmetic expression [-3-4-(-1)] × (-3 ÷ -1) × (-21) × (2 - 1) × [7 - 6 + 4.3]. This problem covers key concepts such as negation, division, and multiplication, following the order of operations. Suitable for students in Grades 5-7.

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