700-348: 4•6, 696-612: 6: 3, 900-(600-130•4): 10,800-250+140: 5•2, 603: 3. 308•3

700-348:4*6=178
696-612:6:3=612:6=102:3=34. 696-34=662
900-(600-130*4):10=130*4=520...600-520=80:10=8...900-8=892
800-250+140:5*2=140:5=28*2=56...800-250=550+56=606
603:3=201
308*3=924