Ответ: 0,00128

[tex] \sqrt{0.25 {x}^{6} {y}^{10} } = 0.5 {x}^{3} {y}^{5} = 0.5 \times {2}^{3} \times {0.2}^{5} = 0.5 \times 8 \times 0.00032 = 0.00128[/tex]