71. (39000+530.400): 100 54000-840.300:10

* (39000 + 530 * 400) : 100 = (39000 + 212000) : 100 = 251000 : 100 = 2510 * 54000 - 840 * 300 : 10 = 54000 - 252000 : 10 = 54000 - 25200 = 28800 * 5264 : 7 * 30 = 752 * 30 = 22560 * 4384 : 8 * 50 = 548 * 50 = 27400