20+30*(12-6)=200
(20+30)*(12-6)=300
(20+30)*12-6=594
20+30×(12-6)=200
(20+30)×(12-6)=300
(20+30)×12-6=594
20+30x(12-6)=200
(20+30)x(12-6)=300
(20+30)x12-6=594
20+30*(12-6)=200
(20+30)*(12-6)=300
(20+30)*12-6=594
20+30x(12-6)=200
(20+30)x(12-6)=300
(20+30)x12-6=594
20+30×(12-6)=200
(20+30)×(12-6)=300
(20+30)×12-6=594