Представь выражение в виде дроби: a) b/(b-c) + b/(b+c)

a) $\frac{b}{b-c} + \frac{b}{b+c} = \frac{b(b+c) + b(b-c)}{(b-c)(b+c)} = \frac{b^2 + bc + b^2 - bc}{b^2 - c^2} = \frac{2b^2}{b^2 - c^2}$ б) $\frac{x+1}{x-2} - \frac{x+3}{x} = \frac{(x+1)x - (x+3)(x-2)}{x(x-2)} = \frac{x^2 + x - (x^2 + x - 6)}{x^2 - 2x} = \frac{6}{x^2 - 2x}$ в) $\frac{m}{m-n} - \frac{m}{m+n} = \frac{m(m+n) - m(m-n)}{(m-n)(m+n)} = \frac{m^2 + mn - m^2 + mn}{m^2 - n^2} = \frac{2mn}{m^2 - n^2}$ г) $\frac{2a}{2a-1} - \frac{1}{2a+1} = \frac{2a(2a+1) - (2a-1)}{(2a-1)(2a+1)} = \frac{4a^2 + 2a - 2a + 1}{4a^2 - 1} = \frac{4a^2 + 1}{4a^2 - 1}$ д) $\frac{a}{a+2} - \frac{a}{a^2 - 4} = \frac{a(a-2) - a}{a^2 - 4} = \frac{a^2 - 2a - a}{a^2 - 4} = \frac{a^2 - 3a}{a^2 - 4}$ e) $\frac{p}{3p-1} - \frac{p}{1+3p} = \frac{p(1+3p) - p(3p-1)}{(3p-1)(3p+1)} = \frac{p + 3p^2 - 3p^2 + p}{9p^2 - 1} = \frac{2p}{9p^2 - 1}$