(600-200)+(180-170)6=(400)+(10)6=400+60=460
(720-200):(100:50)+40=520:(2)+40=260+40=300
(100+25)-(350-300):2=125-(50):2=125-25=100
(456+4)+(238+2)-20=460+240-20=700-20=680
(600-200)+(180-170)6=
(400)+(10)6=
400+60=
460
(720-200):(100:50)+40=
520:(2)+40=
260+40=
300
(100+25)-(350-300):2=
125-(50):2=
125-25=
100
(456+4)+(238+2)-20=
460+240-20=
700-20=
680