4x5-6=

(a)  

6+6x2=

(a)  

10x3-25=

(a)  

12+10x2-5=

(a)  

9x9-9+5=

(a)  

10-5x2+14-2=

(a)  

30-20x0+15=

(a)  

12x3+6-10=

(a)  

15-10+5x0=

(a)