15* (1/2)2 -9* (2/3)2= 15*1/4 - 9*4/9= 15/4-4= - 1/4
15*(1/2)*2-9*(2/3)*2=3
1) 15*2*(1/2)=30*(1/2)=30/1*1/2=15
2) 9*2*(2/3)=18*(2/3)=18/1*2/3=12
3) 15-12=3
