220-50+60=
(830-690)*3=
5000/100/2=
28+17*2=

60/15+96/4=
38+9*17=
39*3-27*2=
47+21*3-29=

900-105*3+42 =
123/3-41=
720+112*3-100=
(63+27/9)*4=

220-50+60=170+60=230(830-690)*3=140*3=4205000:100*2=50*2=10028+17*2=28+34=6260:15+96:4=2+24=2638+9*17=38+153=19139*3-27*2=117-54=6347+21*3-29=47+63-29=110-29=81900-105*3+42=900-315+42=585+42=627123:3-41=41-41=0720+112*3-100=720+336-1001056-100=956(63+27:9)*4=63+3=66*4=264