А) НОК = (2*2*2) * (3*3) * 5 * 7 = 2520
840 = (2*2*2) * 3 * 5 * 7
280 = (2*2*2) * 5 * 7
360 = (2*2*2) * (3*3) * 5
б) НОК = (2*2*2) * (3*3*3) * 5 * 7 = 7560
108 = (2*2) * (3*3*3)
216 = (2*2*2) * (3*3*3)
35 = 5 * 7
в) НОК = (2*2*2*2) * (3*3) * (5*5) * 7 = 25200
350 = 2 * (5*5) * 7
240 = (2*2*2*2) * 3 * 5
72 = (2*2*2) * (3*3)
г) НОК = (2*2*2) * (3*3) * 5 * 7 = 2520
840 = (2*2*2) * 3 * 5 * 7
1260 = (2*2) * (3*3) * 5 * 7
д) НОК = (2*2*2*2) * 3 * 5 * 13 * 17 * 23 = 1219920
240 =(2*2*2*2) * 3 * 5
782 = 2 * 17 * 23
897 = 3 * 13 * 23