Odpowiedź:
zad. 6
[tex] \sqrt{60}≈7.7 \\ \sqrt{160} ≈12.6[/tex]
liczby całkowite
8,9,10,11,12
zad. 7
[tex]6 \sqrt{15} = 2 \sqrt{5} x \: \: \: | \div 2 \sqrt{5} \\ x = \frac{6 \sqrt{15} }{2 \sqrt{5} } = 3 \sqrt{3} [/tex]
[tex]ob = 2 \times 2 \sqrt{5} + 2 \times 3 \sqrt{3} = 4 \sqrt{5} + 6 \sqrt{3} [/tex]
zad. 8
[tex]8 \sqrt{0.05} > \sqrt{0.36} + \sqrt{0.16} \\ 8 \sqrt{0.05} > 0.6 + 0.4 \\ 8 \sqrt{0.05} > 1 \\ 1.78885 > 1[/tex]
Prawdziwa
zad. 9
[tex] \sqrt{0} = 0 \\ \sqrt{1} = 1 \\ \sqrt{121} = 11 \\ \sqrt{55} [/tex]
odp. D
zad. 10
[tex] \sqrt{ \frac{16}{5} } \times \sqrt{5} = \sqrt{ \frac{16}{5} \times 5 } = \sqrt{16} = 4[/tex]
odp. C.
zad. 11
[tex]a)7 \sqrt{10} = \sqrt{10 \times 49} = \sqrt{490} \\ b)8 \sqrt{ \frac{3}{4} } = \sqrt{ \frac{3}{4} \times 64} = \sqrt{3 \times 16} = \sqrt{48}[/tex]
[tex]c) \frac{2}{3} \sqrt{90} = \sqrt{90 \times \frac{4}{9} } = \sqrt{10 \times 4} = \sqrt{40} [/tex]
