(-3)³/[2·(-3)³)]·[5·(-3)²)]/[(-3)²-3+1]=
(-27)/[2·(-27)]·[5·9]/(9-3+1)=
-27/-54·45/7=
27/54·45/7=1/2·45/7=45/14
(0,5²-4)/(0,5²-3·0,5+9):(0,5+2)/(0,5³+27)=
(0,25-4)/0,25-1,5+9):2,5/(0,125+27)=
-3,75/(-0,75+9):2,5/27,125=
-3,75/8,25·27,125/2,5=
-375/100·100/825·27125/1000·10/25=simplificam ce se poate
=-5/11·217/20=-217/44=-4.93(18)