А=34*11, b= 22*35*72

А = 34 * 11 = (30 + 4) * 11 = 30 * 11 + 4 * 11 = 30 * 10 + 1 * 10 + 4 * 10 + 4 * 1 = 300 + 10 + 40 + 4 = 350 + 4 = 354;
b = 22 * 35 * 72 = (22 * 35) * 72 = ( 22 * ( 30 + 5 ) ) * 72 = (22 * 30 + 22 * 5 ) * 72 = (20 * 30 + 2 * 30 + 20 * 5 + 5 * 2) * 72 = ( 600 + 60 + 100 + 10 ) * 72 = 770 * 72 = 770 * 70 + 770 * 2 = 700 * 70 + 70 * 70 + 700 * 2 + 70 * 2 = 49000 + 4900 + 1400 + 140 = 50000 + 4900 + 400 + 140 = 55 000 + 400 + 40 = 55 440.