Zadanie 4.
a)
[tex]a=5[/tex]
[tex]a\sqrt{3}=5\sqrt{3}[/tex]
[tex]2a=2\cdot5=10[/tex]
b)
[tex]a=2\sqrt{3}[/tex]
[tex]a\sqrt{3}=2\sqrt{3}\cdot\sqrt{3}=2\cdot3=6[/tex]
[tex]2a=2\cdot2\sqrt{3}=4\sqrt{3}[/tex]
c)
[tex]a\sqrt{2}=8\sqrt{2}[/tex]
[tex]a=8\sqrt{2}:\sqrt{2}=8[/tex]
d)
[tex]a=3[/tex]
[tex]a\sqrt{2}=3\sqrt{2}[/tex]
e)
[tex]2a=5[/tex]
[tex]a=5:2=\dfrac{5}{2}[/tex]
[tex]a\sqrt{3}=\dfrac{5}{2}\sqrt{3}[/tex]
f)
[tex]a=3\sqrt{2}[/tex]
[tex]a\sqrt{2}=3\sqrt{2}\cdot\sqrt{2}=3\cdot2=6[/tex]
g)
[tex]a\sqrt{3}=2\sqrt{3}[/tex]
[tex]a=2\sqrt{3}:\sqrt{3}=2[/tex]
[tex]2a=2\cdot2=4[/tex]
h)
[tex]a\sqrt{2}=2[/tex]
[tex]a=2:\sqrt{2}=\dfrac{2}{\sqrt{2}}=\dfrac{2\cdot\sqrt{2}}{\sqrt{2}\cdot\sqrt{2}}=\dfrac{2\sqrt{2}}{2}=\sqrt{2}[/tex]
i)
[tex]a\sqrt{3}=5[/tex]
[tex]a=5:\sqrt{3}=\dfrac{5}{\sqrt{3}}=\dfrac{5\cdot\sqrt{3}}{\sqrt{3}\cdot\sqrt{3}}=\dfrac{5\sqrt{3}}{3}[/tex]
[tex]2a=2\cdot\dfrac{5\sqrt{3}}{3}=\dfrac{10\sqrt{3}}{3}[/tex]
Zadanie 12.
[tex]2a=20[/tex]
[tex]a=20:2=10[/tex]
Wysokość drzewa, to 10 m.
[tex]2a=2[/tex]
[tex]a=2:2=1[/tex]
Samolot leci na wysokości 1 km.
[tex]a\sqrt{2}=3[/tex]
[tex]a=3:\sqrt{2}=\dfrac{3}{\sqrt{2}}=\dfrac{3\cdot\sqrt{2}}{\sqrt{2}\cdot\sqrt{2}}=\dfrac{3\sqrt{2}}{2}[/tex]
[tex]x\sqrt{3}=a=\dfrac{3\sqrt{2}}{2}[/tex]
[tex]x=\dfrac{3\sqrt{2}}{2}:\sqrt{3}=\dfrac{3\sqrt{2}}{2}\cdot\dfrac{1}{\sqrt{3}}=\dfrac{3\sqrt{2}}{2\sqrt{3}}=\dfrac{3\sqrt{2}\cdot\sqrt{3}}{2\sqrt{3}\cdot\sqrt{3}}=\dfrac{3\sqrt{6}}{2\cdot3}=\dfrac{\sqrt{6}}{2}[/tex]
[tex]4x=4\cdot\dfrac{\sqrt{6}}{2}=2\sqrt{6}\approx2\cdot2,449=4,898\approx4,9[/tex]
Drabina ma długość 4,9 m.
[tex]a=\dfrac{1}{3}\cdot30=10[/tex]
[tex]x\sqrt{3}=\dfrac{2}{3}\cdot30=\dfrac{2}{1}\cdot10=20[/tex]
[tex]x=20:\sqrt{3}=\dfrac{20}{\sqrt{3}}=\dfrac{20\cdot\sqrt{3}}{\sqrt{3}\cdot\sqrt{3}}=\dfrac{20\sqrt{3}}{3}\approx11,5[/tex]
Krótsze liny są zaczepione w odległości 10 m, a dłuższe 11,5 m.
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Zadanie 4.
a)
[tex]a=5[/tex]
[tex]a\sqrt{3}=5\sqrt{3}[/tex]
[tex]2a=2\cdot5=10[/tex]
b)
[tex]a=2\sqrt{3}[/tex]
[tex]a\sqrt{3}=2\sqrt{3}\cdot\sqrt{3}=2\cdot3=6[/tex]
[tex]2a=2\cdot2\sqrt{3}=4\sqrt{3}[/tex]
c)
[tex]a\sqrt{2}=8\sqrt{2}[/tex]
[tex]a=8\sqrt{2}:\sqrt{2}=8[/tex]
d)
[tex]a=3[/tex]
[tex]a\sqrt{2}=3\sqrt{2}[/tex]
e)
[tex]2a=5[/tex]
[tex]a=5:2=\dfrac{5}{2}[/tex]
[tex]a\sqrt{3}=\dfrac{5}{2}\sqrt{3}[/tex]
f)
[tex]a=3\sqrt{2}[/tex]
[tex]a\sqrt{2}=3\sqrt{2}\cdot\sqrt{2}=3\cdot2=6[/tex]
g)
[tex]a\sqrt{3}=2\sqrt{3}[/tex]
[tex]a=2\sqrt{3}:\sqrt{3}=2[/tex]
[tex]2a=2\cdot2=4[/tex]
h)
[tex]a\sqrt{2}=2[/tex]
[tex]a=2:\sqrt{2}=\dfrac{2}{\sqrt{2}}=\dfrac{2\cdot\sqrt{2}}{\sqrt{2}\cdot\sqrt{2}}=\dfrac{2\sqrt{2}}{2}=\sqrt{2}[/tex]
i)
[tex]a\sqrt{3}=5[/tex]
[tex]a=5:\sqrt{3}=\dfrac{5}{\sqrt{3}}=\dfrac{5\cdot\sqrt{3}}{\sqrt{3}\cdot\sqrt{3}}=\dfrac{5\sqrt{3}}{3}[/tex]
[tex]2a=2\cdot\dfrac{5\sqrt{3}}{3}=\dfrac{10\sqrt{3}}{3}[/tex]
Zadanie 12.
a)
[tex]2a=20[/tex]
[tex]a=20:2=10[/tex]
Wysokość drzewa, to 10 m.
b)
[tex]2a=2[/tex]
[tex]a=2:2=1[/tex]
Samolot leci na wysokości 1 km.
c)
[tex]a\sqrt{2}=3[/tex]
[tex]a=3:\sqrt{2}=\dfrac{3}{\sqrt{2}}=\dfrac{3\cdot\sqrt{2}}{\sqrt{2}\cdot\sqrt{2}}=\dfrac{3\sqrt{2}}{2}[/tex]
[tex]x\sqrt{3}=a=\dfrac{3\sqrt{2}}{2}[/tex]
[tex]x=\dfrac{3\sqrt{2}}{2}:\sqrt{3}=\dfrac{3\sqrt{2}}{2}\cdot\dfrac{1}{\sqrt{3}}=\dfrac{3\sqrt{2}}{2\sqrt{3}}=\dfrac{3\sqrt{2}\cdot\sqrt{3}}{2\sqrt{3}\cdot\sqrt{3}}=\dfrac{3\sqrt{6}}{2\cdot3}=\dfrac{\sqrt{6}}{2}[/tex]
[tex]4x=4\cdot\dfrac{\sqrt{6}}{2}=2\sqrt{6}\approx2\cdot2,449=4,898\approx4,9[/tex]
Drabina ma długość 4,9 m.
d)
[tex]a=\dfrac{1}{3}\cdot30=10[/tex]
[tex]x\sqrt{3}=\dfrac{2}{3}\cdot30=\dfrac{2}{1}\cdot10=20[/tex]
[tex]x=20:\sqrt{3}=\dfrac{20}{\sqrt{3}}=\dfrac{20\cdot\sqrt{3}}{\sqrt{3}\cdot\sqrt{3}}=\dfrac{20\sqrt{3}}{3}\approx11,5[/tex]
Krótsze liny są zaczepione w odległości 10 m, a dłuższe 11,5 m.