2. Найдите значение выражения: a) 0,25 · 196 B) √7 · √28 г) √98/√2 б) 121/256 д) √0,8² - 0,6²

a) \(\sqrt{0.25 \cdot 196}\)

• \(\sqrt{0.25} = 0.5\)
• \(\sqrt{196} = 14\)
• 0.5 \(\cdot\) 14 = 7

б) \(\sqrt{\frac{121}{256}}\)

• \(\sqrt{121} = 11\)
• \(\sqrt{256} = 16\)
• \(\frac{11}{16}\)

в) \(\sqrt{7} \cdot \sqrt{28}\)

• \(\sqrt{7 \cdot 28} = \sqrt{196} = 14\)

г) \(\frac{\sqrt{98}}{\sqrt{2}}\)

• \(\sqrt{\frac{98}{2}} = \sqrt{49} = 7\)

д) \(\sqrt{0.8^2 - 0.6^2}\)

• \(0.8^2 = 0.64\)
• \(0.6^2 = 0.36\)
• \(\sqrt{0.64 - 0.36} = \sqrt{0.28}\)