Вычислите произведение удобным способом:
а) 36 * 25;
б) 25 * 12;
в) 75 * 24;
г) 150 * 42.
Образец.
1) 25 * 24 = 25 * (4 * 6) = (25 * 4) * 6 = 100 * 6 = 600.
2) 75 * 8 = (25 * 3) * (2 * 4) = (25 * 4) * (2 * 3) = 100 * 6 = 600.
36 * 25 = (9 * 4) * 25 = 9 * (4 * 25) = 9 * 100 = 900
25 * 12 = 25 * (4 * 3) = (25 * 4) * 3 = 100 * 3 = 300
75 * 24 = (3 * 25) * (4 * 6) = (25 * 4) * (3 * 6) = 100 * 18 = 1800
150 * 42 = (3 * 50) * (2 * 21) = (50 * 2) * (3 * 21) = 100 * 63 = 6300