IV.- Multiplicación de fracciones

587.588.
\large \frac{b}{3a}.\frac{2a}{5b^{2}}\large \frac{3x^{2}y}{4ab^{2}}.\frac{2ab}{3xy}
589.590.
\large \frac{2x}{x-y}.\frac{x^{2}-y^{2}}{8}\large \frac{x-y}{5a}.\frac{3b}{x-y}
591.592.
\large \frac{a+1}{a-1}.\frac{1}{a+1}\large \frac{5a^{2}b^{3}c}{4a^{2}}.\frac{2a^{3}b}{a^{2}b^{2}d}
593.594.
\large \frac{ab-b^{2}}{3a}.\frac{6a}{8b}\large \frac{a+x}{a^{2}-x^{2}}.\frac{a-x}{x^{2}+a^{2}}
595.596.
\large \frac{a-1}{2a+1}.\frac{1-4a^{2}}{ab-b}\large \frac{a^{2}-b^{2}}{3c-3d}.\frac{c-d}{a+b}
597.598.
\large 3ax(x-\frac{y}{3ax})\large a(a+\frac{b^{2}-a^{2}}{a})
599.600.
\large (1+\frac{b}{a}).\frac{a-b}{2b}\large (x+y).(\frac{1}{x}+\frac{1}{y})
601.602.
\large (x+\frac{a}{b})(x-\frac{a}{b})\large \frac{a^{2}b}{c^{2}}.\frac{2ab}{3b}.\frac{3a}{2a+b}
603.604.
\large \frac{a^{2}-4}{a+3}.\frac{a^{2}-9}{a+2}.\frac{a}{a-3}\large \frac{6ab}{3c-d}(\frac{c+d}{4}-\frac{d}{3})
605.
\large \frac{a^{2}x^{2}+2abx+b^{2}}{(ax-b)}.\frac{a^{2}x^{2}-b^{2}}{(ax+b)} \large .\frac{3}{(ax+b)^{2}}
606.
\large (\frac{1}{1+x^{2}}+\frac{2x^{2}}{1-x^{4}}) \large (\frac{1}{x^{2}}-1)

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