(850-410):8=440:8=55
(925-425):5=500:5=100
(124+248):4=372:4=93
231*4-811-104=924-811-104=9
(154*4)-(212*2)=616-424=192
(128*5)*(749-385)=640*364=232960
255:5+(309-241)=51+68=119
(991-135):(20:5)=856:4=214
(891:3)-(404-199)=297-205=92
(207*2)+(828:4)=414+207=621