1+ 2 -3 -4 *5 +6 +7 +8 =1
20+30*(12-6)=200
(20+30)*(12-6)=300
20+30*12-6=374不用加就可以
(20+30)*12-6=594
1+2*3+4-5-6-7+8=1
20+30*(12-6)=200
(20+30)*(12-6)=300
20+(30*12-6)=374
(20+30)*12-6=594
1、1*2+3-4+5-6-7+8=1
2、20+30*(12-6)=200
(20+30)*(12-6)=300
20+30*12-6=374
(20+30)*12-6=594
(1)(1*2+3-4+5-6-7+8=1
(2)20+30*(12-6)=20+180=200
(20+30)*(12-6)=50*6=300
20+(30*12)-6=380-6=374
(20+30)*12-6=600-6=594