Решение 147 задачи:
* 35 * 14 = 35 * (10 + 4) = 35 * 10 + 35 * 4 = 350 + 140 = 490
* 35 * 40 = 35 * (4 * 10) = (35 * 4) * 10 = 140 * 10 = 1400
* 16 * 20 = 16 * (2 * 10) = (16 * 2) * 10 = 32 * 10 = 320
* 16 * 12 = 16 * (10 + 2) = 16 * 10 + 16 * 2 = 160 + 32 = 192