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


Let's break down the expression step by step:

The given expression appears to be:

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

### Step-by-Step Solution:

1. **Simplify within the brackets**:
    - First, simplify \([-3 - 4 - (-1)]\):
      \[
      -3 - 4 + 1 = -6
      \]
    - So, \([-3 - 4 - (-1)] = -6\).

2. **Simplify the division**:
    - Next

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

Step-by-step solution for simplifying the expression [-3 - 4 - (-1)] × (-3 ÷ -1) × (-21) × (2-1): [7 - 6 + 4.3]. This problem involves the use of basic arithmetic operations, negative numbers, and order of operations. Suitable for students in Grades 6-8.

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