Вычислите удобным способом 1) 4 * 13 * 25 2) 125 * 17 * 8 3) 4 * 24 * 5 4) 50 * 236 * 2 упростите выражение 1) 12 * 3а 2) 8х * 7 3) 27 * b * 5 4) 6a * 7b 5) 35x * 23y 6) 4a * 9 * b * 2 * c

N°1. 1) 4 × 13 × 25 = (4 × 25) × 13 = 100 × 13 = 1300 2) 125 × 17 × 8 = (125 × 8) × 17 = 1000 × 17 = 17000 3) 4 × 24 × 5 = (4 × 5) × 24 = 20 × 24 = 480 4) 50 × 236 × 2 = (50 × 2) × 236 = 100 × 236 = 23600 N°2. 1) 12 × 3a = 36a 2) 8x × 7 = 56x 3) 27 × b × 5 = 135b 4) 6a × 7b = 42ab 5) 35x × 23y = 805xy 6) 4a × 9 × b × 2 × c = 72abc