(5-4+3)2*1=2 (5+4)3-2+1=2 (5+4)-3*2-1=2 (5-4+3-2)*1=2
(5+4-3)(2+1)=2 (5-4+3)2*1=2
(9*9-9)9+9=17 (9-9)*9+9+9=18 (9+9)9+9+9=20