Задание 1. Вычислите значения выражения, применив свойства сложения и умножения.

1. 75 + 123 + 25 = (75 + 25) + 123 = 100 + 123 = 223. 2. 19 + 52 + 81 + 48 = (19 + 81) + (52 + 48) = 100 + 100 = 200. 3. 97 + 42 + 58 + 103 = (97 + 103) + (42 + 58) = 200 + 100 = 300. 4. 64 + 33 + 16 + 47 = (64 + 16) + (33 + 47) = 80 + 80 = 160. 5. 5 * 186 * 2 = (5 * 2) * 186 = 10 * 186 = 1860. 6. 24 * 4 * 819 = (24 * 4) * 819 = 96 * 819 = 78624. 7. 20 * 713 * 5 = (20 * 5) * 713 = 100 * 713 = 71300. 8. (100 + 5) * 7 = 100 * 7 + 5 * 7 = 700 + 35 = 735. 9. 2 * (100 - 4) = 2 * 100 - 2 * 4 = 200 - 8 = 192. 10. 10 * (14 + 16) = 10 * 14 + 10 * 16 = 140 + 160 = 300. 11. 5 * (200 - 2) = 5 * 200 - 5 * 2 = 1000 - 10 = 990. 12. 34 * 8 + 66 * 8 = (34 + 66) * 8 = 100 * 8 = 800. 13. 3 * 112 + 44 * 3 = (112 + 44) * 3 = 156 * 3 = 468. 14. 70 * 7 - 10 * 7 = (70 - 10) * 7 = 60 * 7 = 420. 15. 14 * 8 - 14 * 4 = 14 * (8 - 4) = 14 * 4 = 56.