Eismine

2) (x / y)^5 • y^7 = x^5 • y^7 / y^5 = x^5 • y^2;

4) (x • y)^6 / x^5 = x^6 • y^6 / x^5  = x • y^6;

6) m^12 • (n / m)^10 = m^12 • n^10 / m^10 = m^2 • n^10.