III.- Adición y sustracción de fracciones

561.562.
\large \frac{x}{4}+\frac{x}{6}+\frac{x}{8}\large \frac{5a}{2}-\frac{3a}{4}
563.564.
\large \frac{2b}{7}+a\large \frac{2x-3y}5{+\frac{4x+5y}{6}}
565.
\large \frac{5x}{2}-\frac{x}{4}+\frac{7x}{6}-\frac{3x}{2}
566.
\large \frac{a}{bc}-\frac{1}{b}
567.
\large \frac{a}{b}+\frac{b}{a}+2
568.
\large 1-\frac{a-b}{a+b}
569.
\large \frac{2}{1-x}+\frac{3}{1-x}
570.
\large \frac{a}{a-2}+\frac{a}{a+2}
571.
\large \frac{a}{a+x}+\frac{a}{a-x}
572.
\large \frac{x}{ab}+\frac{y}{bc}+\frac{z}{ac}
573.
\large x+\frac{y}{xz}-\frac{z}{xy}
574.
\large \frac{a^{3}}{b^{2}c}+\frac{a^{2}}{c^{4}b}+\frac{c}{a^{2}c^{3}}
575.
\large \frac{2xy^{2}}{y}-\frac{3}{5}+\frac{y^{2}x}{x^{2}}+\frac{12y}{4}
576.
\large \frac{7}{40b^{2}c^{3}}+\frac{5b}{36c^{2}d}+\frac{11c}{45b^{4}d^{2}}
577.
\large \frac{a+b}{a-b}-\frac{a-b}{a+b}+\frac{a^{2}}{a^{2}-b^{2}}
578.
\large \frac{3a}{a-1}-\frac{2a}{a+1}-\frac{5a}{a^{2}-1}
579.
\large \frac{x+1}{x-2}-\frac{x-2}{2(x+2)}-\frac{1}{4}
580.
\large \frac{2}{1-x}-\frac{3}{1-x^{2}}+\frac{4}{1+x}
581.
\large a-\frac{a^{2}}{a-1}+\frac{1}{a+1}
582.
\large \frac{20x}{4x^{2}-1}-\frac{4}{1-2x}-\frac{7}{2x+1}
583.
\large \frac{6}{1+x}-\frac{4}{1-x}-\frac{10x}{x^{2}-1}
584.
\large \frac{x^{3}}{x-1}-\frac{x^{2}}{x+1}-\frac{1}{x-1}+\frac{1}{x+1}
585.
\large ab(a+b)-\frac{ab(a^{3}-b^{3})}{a^{2}+2ab+b^{2}}

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