3.248: Вычислите наиболее удобным способом.

a) (40 - 3) * 5 = 40 * 5 - 3 * 5 = 200 - 15 = 185; b) 95 * 317 - 85 * 317 = (95 - 85) * 317 = 10 * 317 = 3170; c) 6 * (80 - 2) = 6 * 80 - 6 * 2 = 480 - 12 = 468; d) 87 * 316 - 87 * 306 = 87 * (316 - 306) = 87 * 10 = 870.