II.- Reducir a común denominador

547.
\large \frac{a}{b}\, ,\, \frac{m}{n}\, ,\, \frac{x}{y}
548.
\large \frac{m}{9a^{2}b}\, ,\, \frac{n}{6ab^{2}}\, ,\, \frac{r}{3a^{3}c^{2}}
549.
\large \frac{7a}{40b^{2}c^{3}}\, ,\, \frac{5b}{36c^{2}d}\, ,\, \frac{11c}{45b^{4}d^{2}}
550.
\large \frac{3a^{}}{10b^{5}m}\, ,\, \frac{1}{4b^{2}n}\, ,\, \frac{2a}{5bm}
551.
\large \frac{a}{a^{2}-b^{2}}\, ,\, \frac{1}{a+b}\, ,\, \frac{1}{a-b}
552.
\large \frac{5a^{2}b}{12a^{3}b^{2}c}\, ,\, \frac{4ab^{2}c}{15a^{4}c^{3}d}\, ,\, \frac{3a}{24a^{2}b^{3}c}
553.
\large \frac{x}{2a-2b}\, ,\, \frac{y}{3a+3b}\, ,\, \frac{z}{a^{2}-b^{2}}\, ,\, \frac{a+b}{a-b}
554.
\large \frac{5x}{3x-3}\, ,\, \frac{x-1}{2x+2}\, ,\, \frac{5x-5}{4x^{2}-4}\, ,\, \frac{6(x^{2}+1)}{5}
555.
\large 3x-\frac{4x-5}{3}
556.
\large 5x+\frac{3-8x}{2x+4}
557.
\large x+y-\frac{2xy+y^{2}}{x+y}
558.
\large \frac{4x^{2}+3x+5}{2x-3}-(2x-3)
559.
\large \frac{a^{2}+b^{2}}{ab}\, ,\, \frac{a^{2}}{a-b}\, ,\, \frac{b^{2}}{a+b}\, ,\, \frac{ab}{a^{2}-b^{2}}
560.
\large \frac{m}{2a(m+n)}\, ,\, \frac{n}{4a^{2}(m+n)}\, ,\, \frac{n(n-m)}{4a^{2}(m^{2}-n^{2})}

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