Usměrnění zlomků
Usměrni zlomky:
\large \Large \frac{7}{{3-\sqrt [ 3] {5}}}\large
\large = \Large \frac{7 \left( 9+3\sqrt [ 3] {5}+\sqrt [ 3] {25}\right) }{{22}}\large
\large = \Large \frac{7 \left( 9+3\sqrt [ 3] {5}+\sqrt [ 3] {15}\right) }{{22}}\large
\large = \Large \frac{7 \left( 9+2\sqrt [ 3] {5}+\sqrt [ 3] {25}\right) }{{22}}\large
\large = \Large \frac{7 \left( 9+3\sqrt [ 3] {5}+\sqrt [ 3] {25}\right) }{{23}}\large
Úloha je podobná jako předchozí, s jediným rozdílem, že ve jmenovateli se nachází znaménko minus. Potřebuješ tedy dostat ve jmenovateli vzorec (a – b) · (a2 + ab + b2) = a3 – b3.
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