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. \( 6 \times (-6) + 23 - (-15) = 2 \)