Odpowiedź:
[tex]a) \: \sqrt{16 + 9} = \sqrt{25} = 5 \\ \sqrt{16} + \sqrt{4} = 4 + 2= 6 \\ \sqrt{16 + 9} < \sqrt{16} + \sqrt{9} [/tex]
[tex]b) \sqrt{25 - 9} = \sqrt{16} = 4 \\ \sqrt{25} - \sqrt{9} = 5 - 3 = 2 \\ \sqrt{25 - 9} > \sqrt{25} - \sqrt{9} [/tex]
[tex]c)2 \sqrt{7} = \sqrt{4 \times 7} = \sqrt{28} \\ \sqrt{3 \times 7} = \sqrt{21} \\2 \sqrt{7} > \sqrt{3 \times 7} [/tex]
