[tex]15*\sqrt{\frac{2}{5} } -\sqrt{160} =15*\frac{\sqrt{2} }{\sqrt{5}}-\sqrt{160}=\frac{15\sqrt{2} }{\sqrt{5} } -\sqrt{160}=\frac{15\sqrt{10} }{5} -\sqrt{16*10} =\\\\3\sqrt{10} -4\sqrt{10} =-\sqrt{10}[/tex]
Odpowiedź:
odpowiedz B -√10 ...........
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[tex]15*\sqrt{\frac{2}{5} } -\sqrt{160} =15*\frac{\sqrt{2} }{\sqrt{5}}-\sqrt{160}=\frac{15\sqrt{2} }{\sqrt{5} } -\sqrt{160}=\frac{15\sqrt{10} }{5} -\sqrt{16*10} =\\\\3\sqrt{10} -4\sqrt{10} =-\sqrt{10}[/tex]
Odpowiedź:
odpowiedz B -√10 ...........