Môn Toán Lớp 9: 1.căn3^4(-8)^2 2.căn1,6×căn250×căn19,6×căn10

\[\begin{array}{l}
\# andy\\
1)\sqrt {{3^4}.{{\left( { – 8} \right)}^2}} \\
 = \sqrt {{{\left( {{3^2}} \right)}^2}.{{\left( { – 8} \right)}^2}} \\
 = \left| {{3^2}.\left( { – 8} \right)} \right|\\
 = \left| {{3^2}} \right|.\left| { – 8} \right|\\
 = 9.8\\
 = 72\\
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\\
2)\sqrt {1,6} .\sqrt {250} .\sqrt {19,6} .\sqrt {10} \\
 = \sqrt {1,6\,\,.\,\,250\,\,.\,\,19,6\,\,.\,\,10} \\
 = \sqrt {78400} \\
 = 280
\end{array}\]