Напишите формулы умножения и дробления дробей

Формулы умножения и дробленья дробей:

1) (a/b) * (c/d) = (a * c)/(b * d);

2) (a/b)/(c/d) = (a/b) * (d/c) = (a * d)/(b * c);

3) a ^ n/b ^ n = (a/b) ^ n;

4) a/b * c = (a * c)/b;

5) 1/(b/a) = 1 * (a/b) = a/b;

6) (a/b)/c = (a/b) * (1/c) = a/(b * c);

7) c/(a/b) = c * b/a = (b * c)/a.