1) (25*2400+66000): 70-(52*550-107*140): 20= 2) 51200: 800+294*400+(807032-460733): 267= 3) (548037+416619): 297+(62578-48967)*28= 4) 432765-( 9982705-213521): 208+2450*340=

1) = (60000+66000):70-(28600-14980):20 = 1800-681=1119
2) = 64+117600+1297=118961
3) = 3248+381108=384356
4) = 432765-46967.23+83300=1218797.77