Toán Lớp 8: a) $\frac{5x}{x+5}$+$\frac{10}{x+5}$
b)$\frac{4x}{2x+3}$+$\frac{6}{2x+3}$
c)$\frac{9x}{x+3}$+ $\frac{27}{x+3}$
d) $\frac{20}{x+10}$+ $\frac{2x}{x+10}$
e)$\frac{1}{x+4}$+ $\frac{3}{x-2}$
f) $\frac{3}{x+2}$+ $\frac{4}{x-5}$
g)$\frac{2}{x+6}$+ $\frac{1}{x-4}$
h)$\frac{8}{x+3}$+ $\frac{6}{x-2}$