Question

$\sqrt{ \frac{16}{81} } - \sqrt{ \frac{169}{225} }$
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Answer 1

$\sqrt{\frac{16}{81}}-\sqrt{\frac{169}{225}} =\sqrt{(\frac{4}{9})^{2}}-\sqrt{(\frac{13}{15})^{2}} =\frac{4}{9} -\frac{13}{15}=\frac{20-39}{45}=-\frac{19}{45}\\\\Otvet:\boxed{-\frac{19}{45}}$