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`#tnvt`
`\sqrt{2a}xx\sqrt{8a}-\frac{\sqrt{50a^3}}{\sqrt{2a}}(a>0)`
`=\sqrt{16a^2}-\sqrt{\frac{50a^3}{2a}}`
`=\sqrt{(4a)^2}-\sqrt{25a^2}`
`=|4a|-\sqrt{(5a)^2}`
`=4a-|5a|`
`=4a-5a`
`=-a`
$\sqrt[]{2a}$ × $\sqrt[]{8a}$ - $\frac{\sqrt[]{50a^3}}{\sqrt[]{2a}}$
`=` $\sqrt[]{16a^2}$ -$\sqrt[]{\frac{50a^3}{2a}}$
`=` $\sqrt[]{(4a)^2}$ - $\sqrt[]{25a^2}$
`= |4a| -` $\sqrt[]{(5a)^2}$
`= 4a - |5a|`
`= 4a - 5a`
`= -a`
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