(3a^2-2b)/(0,5b-2a), если a= -1/2 и b=1/6

1)3*(-1/2)²- 2*(1/6)=3/4-2/6=9/12-4/12=5/12

2)0,5*(1/6)-2*(1/2)=5/60+1

(5/6):(65/60)=5/6*(60/65)=10/13