Odmocnina čísla 80
Částečně odmocni číslo \sqrt{80}.
=\sqrt{3^{2} \cdot 3^{2} \cdot 5}=3 \cdot 3 \cdot \sqrt{5}=9 \cdot \sqrt{5}
=\sqrt{2^{2} \cdot 2^{2} \cdot 3}=2 \cdot 2 \cdot \sqrt{3}=4 \cdot \sqrt{3}
=\sqrt{4^{2} \cdot 5}=4 \cdot \sqrt{5}
=\sqrt{2^{2} \cdot 2^{2} \cdot 5}=2 \cdot 2 \cdot \sqrt{5}=4 \cdot \sqrt{5}
Opět jako v předchozích dvou příkladech budeš postupovat tak, že nejdříve si rozložíš číslo 80 na součin prvočísel a pak použiješ vzorec \sqrt{a^{2} \cdot b}=a \cdot \sqrt{b}.
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