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


It looks like the expression you provided is a bit unclear due to the use of non-mathematical symbols. Let's clarify the components and rewrite the expression with proper mathematical symbols so we can evaluate it correctly.

Based on my interpretation, it seems you're trying to express something like this:

\[ \left[ -3 - 4 - (-1) \right] \times \left( \frac{-3}{-1} \right) \times (-21) + (2 - 1) \times \left[ 7 - 6 + 4.3 \right] \]

Let's break it down step by step:

### First, simplify each part:

1. **First term**: 
   \[
   -3 - 4 - (-1) = -3 - 4 + 1 = -6
   \]
   
2. **Second term**:
   \[
   \frac{-3}{-1} = 3
   \]

3. **Third term**:
   \[
   (-21)
   \]

4. **Fourth term**:
   \[
   2 - 1 = 1
   \]

5. **Fifth term**:
   \[
   7 - 6 + 4.3 = 1 + 4

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

Learn how to solve a complex arithmetic expression involving negative numbers, fractions, multiplication, and addition. This problem covers core mathematical concepts such as order of operations (PEMDAS/BODMAS), fraction multiplication, and basic arithmetic rules. Suitable for students in Grades 5-7.

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