(154 + 246) - 400 = 0
1)154 + 246= 400
2) 400 - 400 = 0
350 : ( 785 - 435) = 1
1) 785 - 435 = 350
2) 350 : 350 = 1
740 * ( 1000 : 100) = 7400
1) 1000 : 100 = 10
2) 740 * 10 = 7400
( 856 - 234 - 621 ) * 75 = 75
1) 856 - 234 - 621 = 1
2) 1 * 75 = 75
(345+763):(12*7-83)=1108
1) 345+763 = 1108
2) 12*7-83 = 84-83=1
3)1108 : 1 = 1108