[tex] (\sqrt{98} - 2 \sqrt{50} + \sqrt{32}) \div \frac{1}{ \sqrt{2} } = (7 \sqrt{2} - 2 \sqrt{50} + 4 \sqrt{2} ) \div \frac{1}{ \sqrt{2} } = (11 \sqrt{2} - 2 \sqrt{50} ) \div \frac{1}{ \sqrt{2} } = (11 \sqrt{2} - 10 \sqrt{2} ) \div \sqrt{2} = \sqrt{2} \times \sqrt{2} = \sqrt{4} = 2[/tex]
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