1. a) $36+144:(9-3 \cdot 2)=36+144: 3=36+48=84$. 2 points
b) $(36+144): 9-3 \cdot 2=180: 9-3 \cdot 2=20-6=14$. 2 points
.TOTAL 4 POINTS
1. Add parentheses to the numerical expression $36+144: 9-3 \cdot 2$ so that its value is:
a) 84 ;
b) 14 .