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 = 13002) 125 × 17 × 8 = (125 × 8) × 17 = 1000 × 17 = 170003) 4 × 24 × 5 = (4 × 5) × 24 = 20 × 24 = 4804) 50 × 236 × 2 = (50 × 2) × 236 = 100 × 236 = 23600N°2.1) 12 × 3a = 36a2) 8x × 7 = 56x3) 27 × b × 5 = 135b4) 6a × 7b = 42ab5) 35x × 23y = 805xy6) 4a × 9 × b × 2 × c = 72abc