45 * 36 + 55 * 36 = 36 * (45 + 55) = 36 * 100 = 3 600
51 * 136 - 21 * 136 = 136 * (51 - 21) = 136 * 30 = 4 080
45 * 36 + 55 * 36 = 36 * (45 + 55) = 36 * 100 = 3 600
51 * 136 - 21 * 136 = 136 * (51 - 21) = 136 * 30 = 4 080