Сократите дробь: 1) 3 ху²/15 х²у; 2) 25-а²/3 а-15; 3) 8 в²-8 а²/а²-2 ав+в²

1. 3xy ^ 2/15yx ^ 2 = 3/15 * x / x ^ 2 * y ^ 2/y = y/5x.

2. (25 - a ^ 2) / (3a - 15) = - (a ^ 2 - 25) / (3a - 15) = - (a - 5) (a + 5) / 3 (a - 5) =

= - (a + 5) / 3.

3. (8b ^ 2 - 8a ^ 2) / (a ^ 2 - 2ab + b ^ 2) = - (8a ^ 2 - 8b ^ 2) (a ^ 2 - 2ab + b ^ 2) =

= - 8 (a - b) (a + b) / (a - b) (a - b) = - 8 (a + b) / (a - b).

Ответ:

1. y/5x

2. - (a + 5) / 3

3. - 8 (a + b) / (a - b)