$5-9=$  

(a)  

 $-5+9=$  

(a)  

 $-5-9=$  

(a)  

 $3-17=$  

(a)  

 $-3+17=$  

(a)  

 $-3-17=$  

(a)  

 $5+-3=$  

(a)  

 $-3--1=$  

(a)  

 $-11-\ -3=$  

(a)  

 $13+-7=$  

(a)  

 $-13-–17=$  

(a)  

 $3-\left(-21+-12\right)=$  

(a)  

 $-7-\left(-8-–2\right)=$  

(a)  

 $-13-\left(-5-–5\right)=$  

(a)