Решите срочно 7 класс.Умоляю

А) $\frac{m}{n^3} - \frac{p}{n^3} = \frac{m-p}{n^3}$

в) $\frac{3x-5y}{ac-d} - \frac{4x-6y}{-d+ac} =\frac{3x-5y}{ac-d} - \frac{4x-6y}{ac-d} = \frac{3x-5y-4x+6y}{ac-d}= \frac{y-x}{ac-d}$

д) $\frac{b}{x-y} + \frac{c}{y-x} =\frac{b}{x-y} - \frac{c}{x-y} = \frac{b-c}{x-y}$

ж) $\frac{3m}{(m-n)^2} + \frac{n}{(n-m)^2} = \frac{3m+n}{(m-n)^2}$

и) $\frac{1}{a^2-ab} - \frac{1}{ab-b^2} = \frac{1}{a(a-b)} - \frac{1}{b(a-b)} = \frac{b-a}{ab(a-b)}$

л) $\frac{27-x^3}{x^2+3x+9} + \frac{x^3+64}{x^2-4x+16} = \frac{27-x^3+x^3+64}{(x^2+3x+9)(x^2-4x+16)} = \frac{91}{(x^2+3x+9)(x^2-4x+16)}$