A.
\sqrt{2600}\approx 40
\sqrt{2600}=\sqrt{26}\cdot \sqrt{100}\approx 5,099\cdot 10\approx 50,9\approx51
B.
\sqrt{1500}\approx 50
\sqrt{1500}=\sqrt{15}\cdot\sqrt{100}\approx 3,87\cdot 10\approx 38,7\approx40
C.
\sqrt{2400}\approx 60 Fałsz
\sqrt{2400}=\sqrt{24}\cdot \sqrt{100}=\sqrt{4\cdot6}\cdot10=2\sqrt6*10=20\sqrt6\approx 20\cdot2,449\approx48,98\approx 50
D.
\sqrt{5000}\approx 70 Prawda
\sqrt{5000}=\sqrt{50}\cdot\sqrt{100}=\sqrt{25\cdot2}\cdot 10=5\sqrt2\cdot10=50\sqrt2\approx50\cdot 1,414\approx70,7\approx70
Odpowiedź: D