18:(-2)-(-9+4)= -81+9×(-6)= 7×1-11:1+5×(-2)= 6×(-6)+23-(-15)=

Let's solve each expression step by step. 1. **Expression: \( 18:(-2)-(-9+4) \)** - First, simplify \(-9 + 4\): \[ -9 + 4 = -5 \] - Now substitute this back into the expression: \[ 18:(-2) - (-5) \] - Calculate \( 18:(-2) \): \[ 18 \div (-2) = -9 \] - Substitute this back: \[ -9 - (-5) = -9 + 5 = -4 \] **Result: \(-4\)** 2. **Expression: \( -81 + 9 \times (-6) \)** - Calculate \( 9 \times (-6) \): \[ 9 \times (-6) = -54 \] - Now substitute this back into the expression: \[ -81 - 54 \] - Now calculate: \[ -81 - 54 = -135 \] **Result: \(-135\)** 3. **Expression: \( 7 \times 1 - 11 : 1 + 5 \times (-2) \)** - Calculate \( 7 \times 1 \): \[ 7 \times 1 = 7 \] - Calculate \( 11 : 1 \): \[ 11 \div 1 = 11 \] - Calculate \( 5 \times (-2) \): \[ 5 \times (-2) = -10 \] - Now substitute all calculations back into the expression: \[ 7 - 11 + (-10) \] - Combine the terms: \[ 7 - 11 = -4 \] \[ -4 - 10 = -14 \] **Result: \(-14\)** 4. **Expression: \( 6 \times (-6) + 23 - (-15) \)** - Calculate \( 6 \times (-6) \): \[ 6 \times (-6) = -36 \] - Substitute this back into the expression: \[ -36 + 23 - (-15) \] - Calculate \(-(-15)\): \[ -(-15) = 15 \] - Now, substitute that back: \[ -36 + 23 + 15 \] - Combine the values: \[ -36 + 23 = -13 \] \[ -13 + 15 = 2 \] **Result: \(2\)** ### Summary of Results: 1. \( 18:(-2)-(-9+4) = -4 \) 2. \( -81+9 \times (-6) = -135 \) 3. \( 7 \times 1 - 11 : 1 + 5 \times (-2) = -14 \) 4. \( 6 \times (-6) + 23 - (-15) = 2 \)