Brüche/Addition und Subtraktion/Aufgabe

< Brüche < Addition und Subtraktion

Bringen Sie auf einen Bruchstrich (geschickter Nenner?):

${}{\frac {1}{5}}+{\frac {9}{10}}$
${}{\frac {7}{6}}-{\frac {3}{4}}$
${}2{\frac {3}{4}}-{\frac {7}{7}}$
${}{\frac {2}{3}}+{\frac {7}{12}}-1{\frac {3}{8}}$
${}{\frac {a}{b}}+{\frac {c}{d}}$
${}{\frac {a}{b}}+{\frac {c}{b^{2}}}$
${}{\frac {a}{4bc}}+{\frac {d}{6c^{2}}}$
${}{\frac {a}{b+c}}+{\frac {d}{b-c}}$
${}{\frac {a}{1+x}}+{\frac {b}{1-x}}+{\frac {c}{(1+x)^{2}}}$
${}{\frac {a-b}{c+d}}+{\frac {c-d}{a+b}}$

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