Using factorization calculation: 23 and three fifths * 25-12 and two fifths * 25 + 8 and four fifths * 25 The second way: the fourth power of 39 * 37-13 * 3 Calculation: 1.100 & sup2; - 99 & sup2; + 98 & sup2; - 97 & sup2; + 96 & sup2; - 95 & sup2; ··· + 2 & sup2; - 1 & sup2; The answer should be quick, good (NEAT) and correct. If it is done, (pay attention to the process)

Using factorization calculation: 23 and three fifths * 25-12 and two fifths * 25 + 8 and four fifths * 25 The second way: the fourth power of 39 * 37-13 * 3 Calculation: 1.100 & sup2; - 99 & sup2; + 98 & sup2; - 97 & sup2; + 96 & sup2; - 95 & sup2; ··· + 2 & sup2; - 1 & sup2; The answer should be quick, good (NEAT) and correct. If it is done, (pay attention to the process)

[sorry, it's too late to look at the topic] 1) 23 and three fifths * 25-12 and two fifths * 25 + 8 and four fifths * 25 = 23 × 25 + (3 / 5) × 25-12 × 25 - (2 / 5) × 25 + 8 × 25 + (4 / 5) × 25 = (23-12 + 8) × 25 + (15-10 + 20) = 19 × 25 + 25 = 25 × (19 + 1) = 25 × 20 = 5002) 39 * 37-13 * 3